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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: 20 left in stock
Fulfilled by HVAC Surplus Store
Arrives Wednesday, Mar 18
Order within 17 hours and 31 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.
  • 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: 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: ‎43


Manufacturer: ‎UEI.


Item Weight: ‎3.2 ounces


Department: ‎unisex-adult


Item model number: ‎PDT655


Date First Available: ‎April 22, 2021


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Wednesday, Mar 18

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
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • PayTomorrow Financing
  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Similar Products

Top Amazon Reviews

    • UEi PDT655 is very nice and accurate
Review Image by ALE ALE
Review Image by ALE 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 by ALE ALE
    • 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.
    • Great price and size
Excellent tool
Reviewed in the United States on June 28, 2025 by Edith Cruz
    • 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
    • HUGE! No longer a pocket thermometer.
Review Image by Christina 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 by Christina Christina
    • Works very well
Bigger than expected definitely wish it was smaller but it works great!
Reviewed in the United States on July 29, 2025 by Joshua Castleberry
    • Product review
No issues with the product or delivery. All good.
Reviewed in the United States on September 29, 2025 by Jim Vaughn

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