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UEi Test Instruments

UEi PDT655 Differential Temperature Folding Pocket Thermometer, HVAC Digital Thermometer with Backlit Display and Magnetic Mount, Measures -58 to 572°F

  • Based on 275 reviews
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Availability: In Stock.
Fulfilled by Amazon
Arrives Tuesday, Jul 14
Order within 9 hours and 55 minutes
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Features

  • 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.
  • COMPACT POCKET SIZE: Compact and fieldready, the PDT655 measures 6" 1.5" 0.75" when folded and includes a 5" probe, making it ideal for pockets, tool pouches, and HVAC service bags
  • 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.

Brand: UEi Test Instruments


Special Feature: Differential Temperature


Color: Black, Yellow


Age Range (Description): Adult


Included Components: Battery (CR2032), User Manual


Outer Material: Plastic


Specification Met: Ce Conformity


Display Type: Digital


Connectivity Technology: Wire


Product Care Instructions: Wipe Clean


Additional Features: Differential Temperature


Display Type: Digital


Connectivity Technology: Wire


Power Source: Battery Powered


Number of Batteries: 1 Nonstandard Battery batteries required.


Upper Temperature Range: 572 Degrees Fahrenheit


Response Time: 500 Milliseconds


Reusability: Reusable


Indoor Outdoor Usage: Indoor


Smart Home Compatibility: Not Smart Home Compatible


Outer Material: Plastic


Product Care Instructions: Wipe Clean


Color: Black, Yellow


Style Name: Industrial


Brand Name: UEi Test Instruments


Age Range Description: Adult


Included Components: Battery (CR2032), User Manual


Model Name: Differential Folding Pocket Thermometer w/ T1/T2


Model: PDT655


UPC: 053533508543 535335085434


Global Trade Identification Number: 43


Manufacturer: UEI


Part Number: PDT655


Specification Met: Ce Conformity


Unit Count: 1 Count


Item Length: 6 Inches


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Tuesday, Jul 14

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
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  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

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Top Amazon Reviews

    • UEi PDT655 is very nice and accurate UEi PDT655 is very nice and accurate
Review Image by ALE
Review Image by ALE
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 ... show more
Reviewed in the United States on February 1, 2024 Reviewed in the United States on February 1, 2024 by ALE
    • Great tool
Used by pros for a reason. Easy to ready. Very handy.
Reviewed in the United States on March 1, 2026 by N. Plumley
    • I love this thing
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
Reviewed in the United States on July 1, 2025 by Tommy
    • They are big
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
Reviewed in the United States on August 22, 2025 by Dennis R.
    • Delivered as described
Delivered as described Love the Big lighted screen
Reviewed in the United States on April 18, 2026 by Johnny Viramontes
    • Big view!
Buy 2. Very easy to read! I habe good eyes, but it's nice to see your temp split (Delta) From a distance.
Reviewed in the United States on August 23, 2025 by Anna Calamari
    • Broke after one month Broke after one month
Review Image by Jeff wiseman
Broke after a month. All I use it for is to check temps in fiberglass plenums, and I am very gentle with it. Very disappointing
Reviewed in the United States on April 30, 2026 Reviewed in the United States on April 30, 2026 by Jeff wiseman
    • HUGE! No longer a pocket thermometer. HUGE! No longer a pocket thermometer.
Review Image by Christina
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.
Reviewed in the United States on November 5, 2023 Reviewed in the United States on November 5, 2023 by Christina

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