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UEi PDT655 Differential Temperature Folding Pocket Thermometer HVAC Digital Thermometer with Backlit Display and Magnetic Mount Measures -58

★ 4.4 · 325 ratings
$54.99

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UEi PDT655 Differential Temperature Folding Pocket Thermometer HVAC Digital Thermometer with Backlit Display and Magnetic Mount Measures -58, $54.99, Availability unknown. Image 1 of 4.

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UEi PDT655 Differential Temperature Folding Pocket Thermometer HVAC Digital Thermometer with Backlit Display and Magnetic Mount Measures -58
SKU
JC12041
Explore product details ↓

Source specifications

Brand
UEi Test Instruments
Special Feature
Auto Shut Down, Min/Max, Low Battery Warning, Large Digital Display, Quick Read
Color
Multicoloured
Age Range (Description)
Adult
Included Components
PDT655
Outer Material
Plastic
Specification Met
Ce Conformity
Display Type
Digital
Connectivity Technology
Wire
Product Care Instructions
Wipe Clean
Brand
‎UEi Test Instruments
Special Feature
‎Auto Shut Down, Min/Max, Low Battery Warning, Large Digital Display, Quick Read
Color
‎Multicoloured
Age Range (Description)
‎Adult
Included Components
‎PDT655
Outer Material
‎Plastic
Specification Met
‎Ce Conformity
Display Type
‎Digital
Connectivity Technology
‎Wire
Product Care Instructions
‎Wipe Clean
Unit Count
‎1 Count
Power Source
‎See Product Details
Model Name
‎Differential Folding Pocket Thermometer w/ T1/T2
Item Length
‎6 Inches
Upper Temperature Rating
‎572 Degrees Fahrenheit
Response Time
‎500 Milliseconds
Reusability
‎Reusable
Style
‎Foldable UV/White Beam
Indoor/Outdoor Usage
‎Indoor
UPC
‎053533508543 535335085434
Global Trade Identification Number
‎00053533508543
Manufacturer
‎UEI.
Item Weight
‎3.2 ounces
Department
‎unisex-adult
ASIN
‎B0938HPW8R
Item model number
‎PDT655
Date First Available
‎April 22, 2021
Best Sellers Rank
#16,652 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #7 in Lab Digital Thermometers #60 in Health Care Thermometers

The details

About this item

Product description Additional information for the PDT655 The UEi PDT655 is a back-folding digital pocket thermometer capable of calculating differential temperature. The large and glove friendly design, hands-free magnetic mount, and folding probe capable of reading in any position make it the ideal choice for any HVAC/R job. The large and glove friendly design, hands-free magnetic mount, and folding probe capable of reading in any position make it the ideal choice for any HVAC/R job. The PDT655 offers readings in either Fahrenheit or Celsius scales and features a reading range of -58-572 °F (-50-300 °C). The large backlit display features a low battery indicator, Min/Max functions, and allows you to designate T1 and T2 to calculate T1-T2. The 5 in. probe allows you to easily get reliable and accurate measurements in either ambient air or direct contact in solids and DIFFERENTIAL TEMPERATURE: PDT655 can store temperature readings and measure differential temperature by Measuring (T1 - T2); VERSATILE: The PDT655 fits in your pocket and can take readings in tight spaces with a folding probe.; EASY-TO-READ: The PDT655 comes equipped with a large digital display for easy reading. Ther

  • DIFFERENTIAL TEMPERATURE: PDT655 can store temperature readings and measure differential temperature by Measuring (T1 - T2)
  • VERSATILE: The PDT655 fits in your pocket and can take readings in tight spaces with a folding probe.
  • EASY-TO-READ: The PDT655 comes equipped with a large digital display for easy reading. There is also a backlight to illuminate display in dark spaces.
  • HANDS-FREE: The PDT655 includes a built in magnet that enables hands free operation for easy measurement of ducts and vents
  • FAST READING: The PDT655 provides quick readings with a temperature probe that refreshes every second.

Product information

Materials and care

Outer Material
Plastic
Product Care Instructions
Wipe Clean
Outer Material
‎Plastic
Product Care Instructions
‎Wipe Clean

From the manufacturer

Product details and media

Product description Additional information for the PDT655 The UEi PDT655 is a back-folding digital pocket thermometer capable of calculating differential temperature. The large and glove friendly design, hands-free magnetic mount, and folding probe capable of reading in any position make it the ideal choice for any HVAC/R job. The large and glove friendly design, hands-free magnetic mount, and folding probe capable of reading in any position make it the ideal choice for any HVAC/R job. The PDT655 offers readings in either Fahrenheit or Celsius scales and features a reading range of -58-572 °F (-50-300 °C). The large backlit display features a low battery indicator, Min/Max functions, and allows you to designate T1 and T2 to calculate T1-T2. The 5 in. probe allows you to easily get reliable and accurate measurements in either ambient air or direct contact in solids and liquids. See More

Highlights: DIFFERENTIAL TEMPERATURE: PDT655 can store temperature readings and measure differential temperature by Measuring (T1 - T2) VERSATILE: The PDT655 fits in your pocket and can take readings in tight spaces with a folding probe. EASY-TO-READ: The PDT655 comes equipped with a large digital display for easy reading. There is also a backlight to illuminate display in dark spaces. HANDS-FREE: The PDT655 includes a built in magnet that enables hands free operation for easy measurement of ducts and vents FAST READING: The PDT655 provides quick readings with a temperature probe that refreshes every second.

Key details: Brand: ‎UEi Test Instruments | Special Feature: ‎Auto Shut Down, Min/Max, Low Battery Warning, Large Digital Display, Quick Read | Color: ‎Multicoloured | Age Range (Description): ‎Adult | Included Components: ‎PDT655 | Outer Material: ‎Plastic | Specification Met: ‎Ce Conformity | Display Type: ‎Digital | Connectivity Technology: ‎Wire | Product Care Instructions: ‎Wipe Clean

What you can expect: DIFFERENTIAL TEMPERATURE: PDT655 can store temperature readings and measure differential temperature by Measuring (T1 - T2) VERSATILE: The PDT655 fits in your pocket and can take readings in tight spaces with a folding probe. EASY-TO-READ: The PDT655 comes equipped with a large digital display for easy reading. There is also a backlight to illuminate display in dark spaces. HANDS-FREE: The PDT655 includes a built in magnet that enables hands free operation for easy measurement of ducts and vents FAST READING: The PDT655 provides quick readings with a temperature probe that refreshes every second.

Customer feedback: 4.4/5 average rating.

Customers say: Customers find the thermometer well-made and accurate, with good functionality. Customers report durability issues, with one mentioning it only lasted a few months.

Review snippets: The device is somewhat on the larger size, but for most users this is a plus. Its length is 6 inches and the width is 1.5 and it about ¾ inch thick. It will fit in a pocket but there / Used by pros for a reason. Easy to ready. Very handy. Read more

Product description Additional information for the PDT655 The UEi PDT655 is a back-folding digital pocket thermometer capable of calculating differential temperature. The large and glove friendly design, hands-free magnetic mount, and folding probe capable of reading in any position make it the ideal choice for any HVAC/R job. The large and glove friendly design, hands-free magnetic mount, and folding probe capable of reading in any position make it the ideal choice for any HVAC/R job. The PDT655 offers readings in either Fahrenheit or Celsius scales and features a reading range of -58-572 °F (-50-300 °C). The large backlit display features a low battery indicator, Min/Max functions, and allows you to designate T1 and T2 to calculate T1-T2. The 5 in. probe allows you to easily get reliable and accurate measurements in either ambient air or direct contact in solids and liquids. See More

UEi PDT655 Differential Temperature Folding Pocket Thermometer HVAC Digital Thermometer with Backlit Display and Magnetic Mount Measures -58 — product detail 1UEi PDT655 Differential Temperature Folding Pocket Thermometer HVAC Digital Thermometer with Backlit Display and Magnetic Mount Measures -58 — product detail 2UEi PDT655 Differential Temperature Folding Pocket Thermometer HVAC Digital Thermometer with Backlit Display and Magnetic Mount Measures -58 — product detail 3UEi PDT655 Differential Temperature Folding Pocket Thermometer HVAC Digital Thermometer with Backlit Display and Magnetic Mount Measures -58 — product detail 4

Customer feedback

Customer ratings

4.4 out of 5

325 ratings

Customers find the thermometer well-made and accurate, with good functionality. Customers report durability issues, with one mentioning it only lasted a few months.

ALE

5.0 out of 5 stars UEi PDT655 is very nice and accurate

Rating: 5

February 1, 2024

Verified purchase

The device is somewhat on the larger size, but for most users this is a plus. Its length is 6 inches and the width is 1.5 and it about ¾ inch thick. It will fit in a pocket but there will be no hiding it there, too long for that. However, it’s actually about ½ inch shorter that the Samsung phone I carry. The readout numbers are ¾ high and easy to read from 10ft away with good lighting. The display does light up, but only for about 4 seconds, just long enough to see the number if you’re in a dark basement or attic. The probe length is 5 inches and has enough mechanical resistance that it holds the position as you place it into a vent or hole. I was able to hang it onto a vertical return grill by the probe only, since in this case the grill was aluminum. The built-in magnets will hold it nicely on a flat metal area but probably not on a round duct. On those you could easily hang it by the probe though. It uses 1 CR2032 battery which helps keep the weight down. It’s a common enough battery that big box and drug stores sell them and they are cheap. It will self-power off after one hour, a nice feature, but it also means that any readings you have also disappear. It updates very quickly and follows the temp rise in a duct very near real time. It followed the rise I saw with my Fluke thermocouple and I was impressed with that. Accuracy seems reasonable and matches up nicely with other thermometers that I believe to be accurate. See photo Read more

Customer review imageCustomer review image

N. Plumley

5.0 out of 5 stars Great tool

Rating: 5

March 1, 2026

Verified purchase

Used by pros for a reason. Easy to ready. Very handy. Read more

Dennis R.

4.0 out of 5 stars They are big

Rating: 4

August 22, 2025

Verified purchase

It works good but it is much larger than the older ones definitely can’t keep two in your shirt picked anymore. Also one of them the back light does not work Read more

Tommy

5.0 out of 5 stars I love this thing

Rating: 5

July 1, 2025

Verified purchase

I do air conditioning and this is a great thermometer keeps track of the high and low temperatures and read out is very big numbers Read more

Anna Calamari

5.0 out of 5 stars Big view!

Rating: 5

August 23, 2025

Verified purchase

Buy 2. Very easy to read! I habe good eyes, but it's nice to see your temp split (Delta) From a distance. Read more

Christina

5.0 out of 5 stars HUGE! No longer a pocket thermometer.

Rating: 5

November 5, 2023

Verified purchase

An accurate well made thermometer that is much larger than the common pocket thermometer. It will fit a pocket, alone. If you buy it, it might not fit your maintenance pouch. Read more

Customer review image

Joshua Castleberry

5.0 out of 5 stars Works very well

Rating: 5

July 29, 2025

Verified purchase

Bigger than expected definitely wish it was smaller but it works great! Read more

Jim Vaughn

5.0 out of 5 stars Product review

Rating: 5

September 29, 2025

Verified purchase

No issues with the product or delivery. All good. Read more

Complete product information
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        "title": "5.0 out of 5 stars UEi PDT655 is very nice and accurate",
        "body": "The device is somewhat on the larger size, but for most users this is a plus. Its length is 6 inches and the width is 1.5 and it about ¾ inch thick. It will fit in a pocket but there will be no hiding it there, too long for that. However, it’s actually about ½ inch shorter that the Samsung phone I carry. The readout numbers are ¾ high and easy to read from 10ft away with good lighting. The display does light up, but only for about 4 seconds, just long enough to see the number if you’re in a dark basement or attic. The probe length is 5 inches and has enough mechanical resistance that it holds the position as you place it into a vent or hole. I was able to hang it onto a vertical return grill by the probe only, since in this case the grill was aluminum. The built-in magnets will hold it nicely on a flat metal area but probably not on a round duct. On those you could easily hang it by the probe though. It uses 1 CR2032 battery which helps keep the weight down. It’s a common enough battery that big box and drug stores sell them and they are cheap. It will self-power off after one hour, a nice feature, but it also means that any readings you have also disappear. It updates very quickly and follows the temp rise in a duct very near real time. It followed the rise I saw with my Fluke thermocouple and I was impressed with that. Accuracy seems reasonable and matches up nicely with other thermometers that I believe to be accurate. See photo Read more",
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      {
        "title": "4.0 out of 5 stars They are big",
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        "author": "Dennis R.",
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      },
      {
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  "short_description": "Product description Additional information for the PDT655 The UEi PDT655 is a back-folding digital pocket thermometer capable of calculating differential temperature. The large and glove friendly design, hands-free magnetic mount, and folding probe capable of reading in any position make it the ideal choice for any HVAC/R job. The large and glove friendly design, hands-free magnetic mount, and folding probe capable of reading in any position make it the ideal choice for any HVAC/R job. The PDT655 offers readings in either Fahrenheit or Celsius scales and features a reading range of -58-572 °F (-50-300 °C). The large backlit display features a low battery indicator, Min/Max functions, and allows you to.",
  "about_this_item": "Product description Additional information for the PDT655 The UEi PDT655 is a back-folding digital pocket thermometer capable of calculating differential temperature. The large and glove friendly design, hands-free magnetic mount, and folding probe capable of reading in any position make it the ideal choice for any HVAC/R job. The large and glove friendly design, hands-free magnetic mount, and folding probe capable of reading in any position make it the ideal choice for any HVAC/R job. The PDT655 offers readings in either Fahrenheit or Celsius scales and features a reading range of -58-572 °F (-50-300 °C). The large backlit display features a low battery indicator, Min/Max functions, and allows you to designate T1 and T2 to calculate T1-T2. The 5 in. probe allows you to easily get reliable and accurate measurements in either ambient air or direct contact in solids and DIFFERENTIAL TEMPERATURE: PDT655 can store temperature readings and measure differential temperature by Measuring (T1 - T2); VERSATILE: The PDT655 fits in your pocket and can take readings in tight spaces with a folding probe.; EASY-TO-READ: The PDT655 comes equipped with a large digital display for easy reading. Ther",
  "long_description": "Product description Additional information for the PDT655 The UEi PDT655 is a back-folding digital pocket thermometer capable of calculating differential temperature. The large and glove friendly design, hands-free magnetic mount, and folding probe capable of reading in any position make it the ideal choice for any HVAC/R job. The large and glove friendly design, hands-free magnetic mount, and folding probe capable of reading in any position make it the ideal choice for any HVAC/R job. The PDT655 offers readings in either Fahrenheit or Celsius scales and features a reading range of -58-572 °F (-50-300 °C). The large backlit display features a low battery indicator, Min/Max functions, and allows you to designate T1 and T2 to calculate T1-T2. The 5 in. probe allows you to easily get reliable and accurate measurements in either ambient air or direct contact in solids and liquids. See More\n\nHighlights: DIFFERENTIAL TEMPERATURE: PDT655 can store temperature readings and measure differential temperature by Measuring (T1 - T2) VERSATILE: The PDT655 fits in your pocket and can take readings in tight spaces with a folding probe. EASY-TO-READ: The PDT655 comes equipped with a large digital display for easy reading. There is also a backlight to illuminate display in dark spaces. HANDS-FREE: The PDT655 includes a built in magnet that enables hands free operation for easy measurement of ducts and vents FAST READING: The PDT655 provides quick readings with a temperature probe that refreshes every second.\n\nKey details: Brand: ‎UEi Test Instruments | Special Feature: ‎Auto Shut Down, Min/Max, Low Battery Warning, Large Digital Display, Quick Read | Color: ‎Multicoloured | Age Range (Description): ‎Adult | Included Components: ‎PDT655 | Outer Material: ‎Plastic | Specification Met: ‎Ce Conformity | Display Type: ‎Digital | Connectivity Technology: ‎Wire | Product Care Instructions: ‎Wipe Clean\n\nWhat you can expect: DIFFERENTIAL TEMPERATURE: PDT655 can store temperature readings and measure differential temperature by Measuring (T1 - T2) VERSATILE: The PDT655 fits in your pocket and can take readings in tight spaces with a folding probe. EASY-TO-READ: The PDT655 comes equipped with a large digital display for easy reading. There is also a backlight to illuminate display in dark spaces. HANDS-FREE: The PDT655 includes a built in magnet that enables hands free operation for easy measurement of ducts and vents FAST READING: The PDT655 provides quick readings with a temperature probe that refreshes every second.\n\nCustomer feedback: 4.4/5 average rating.\n\nCustomers say: Customers find the thermometer well-made and accurate, with good functionality. Customers report durability issues, with one mentioning it only lasted a few months.\n\nReview snippets: The device is somewhat on the larger size, but for most users this is a plus. Its length is 6 inches and the width is 1.5 and it about ¾ inch thick. It will fit in a pocket but there / Used by pros for a reason. Easy to ready. Very handy. Read more\n\nProduct description Additional information for the PDT655 The UEi PDT655 is a back-folding digital pocket thermometer capable of calculating differential temperature. The large and glove friendly design, hands-free magnetic mount, and folding probe capable of reading in any position make it the ideal choice for any HVAC/R job. The large and glove friendly design, hands-free magnetic mount, and folding probe capable of reading in any position make it the ideal choice for any HVAC/R job. The PDT655 offers readings in either Fahrenheit or Celsius scales and features a reading range of -58-572 °F (-50-300 °C). The large backlit display features a low battery indicator, Min/Max functions, and allows you to designate T1 and T2 to calculate T1-T2. The 5 in. probe allows you to easily get reliable and accurate measurements in either ambient air or direct contact in solids and liquids. See More",
  "long_description_blocks": [
    {
      "type": "p",
      "text": "Product description Additional information for the PDT655 The UEi PDT655 is a back-folding digital pocket thermometer capable of calculating differential temperature. The large and glove friendly design, hands-free magnetic mount, and folding probe capable of reading in any position make it the ideal choice for any HVAC/R job. The large and glove friendly design, hands-free magnetic mount, and folding probe capable of reading in any position make it the ideal choice for any HVAC/R job. The PDT655 offers readings in either Fahrenheit or Celsius scales and features a reading range of -58-572 °F (-50-300 °C). The large backlit display features a low battery indicator, Min/Max functions, and allows you to designate T1 and T2 to calculate T1-T2. The 5 in. probe allows you to easily get reliable and accurate measurements in either ambient air or direct contact in solids and liquids. See More"
    },
    {
      "type": "p",
      "text": "Highlights: DIFFERENTIAL TEMPERATURE: PDT655 can store temperature readings and measure differential temperature by Measuring (T1 - T2) VERSATILE: The PDT655 fits in your pocket and can take readings in tight spaces with a folding probe. EASY-TO-READ: The PDT655 comes equipped with a large digital display for easy reading. There is also a backlight to illuminate display in dark spaces. HANDS-FREE: The PDT655 includes a built in magnet that enables hands free operation for easy measurement of ducts and vents FAST READING: The PDT655 provides quick readings with a temperature probe that refreshes every second."
    },
    {
      "type": "p",
      "text": "Key details: Brand: ‎UEi Test Instruments | Special Feature: ‎Auto Shut Down, Min/Max, Low Battery Warning, Large Digital Display, Quick Read | Color: ‎Multicoloured | Age Range (Description): ‎Adult | Included Components: ‎PDT655 | Outer Material: ‎Plastic | Specification Met: ‎Ce Conformity | Display Type: ‎Digital | Connectivity Technology: ‎Wire | Product Care Instructions: ‎Wipe Clean"
    },
    {
      "type": "p",
      "text": "What you can expect: DIFFERENTIAL TEMPERATURE: PDT655 can store temperature readings and measure differential temperature by Measuring (T1 - T2) VERSATILE: The PDT655 fits in your pocket and can take readings in tight spaces with a folding probe. EASY-TO-READ: The PDT655 comes equipped with a large digital display for easy reading. There is also a backlight to illuminate display in dark spaces. HANDS-FREE: The PDT655 includes a built in magnet that enables hands free operation for easy measurement of ducts and vents FAST READING: The PDT655 provides quick readings with a temperature probe that refreshes every second."
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      "type": "p",
      "text": "Customer feedback: 4.4/5 average rating."
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