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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
Condition: New
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This item's return window has been extended for the holiday season: FREE refund/replacement until Jan 31, 2026

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Availability: In Stock.
Fulfilled by Amazon
Arrives Thursday, Dec 4
Order within 23 hours and 57 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: Backlit


Color: Black, Yellow


Age Range (Description): Adult


Included Components: magnetic mount, folding


Outer Material: Plastic


Specification Met: Ce Conformity


Display Type: Digital


Product Care Instructions: Wipe Clean


Unit Count: 1 Count


Product Dimensions ‏ : ‎ 1.5 x 0.88 x 5.9 inches; 3.2 ounces


Item model number ‏ : ‎ PDT655


Date First Available ‏ : ‎ April 22, 2021


Manufacturer ‏ : ‎ UEI.


Best Sellers Rank: #10,840 in Industrial & Scientific (See Top 100 in Industrial & Scientific) #6 in Lab Digital Thermometers #45 in Health Care Thermometers


#6 in Lab Digital Thermometers:


#45 in Health Care Thermometers:


Customer Reviews: 4.4 4.4 out of 5 stars 275 ratings


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Thursday, Dec 4

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
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
    • Working good
Good
Reviewed in the United States on September 24, 2025 by Gavin
    • 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
    • Product review
No issues with the product or delivery. All good.
Reviewed in the United States on September 29, 2025 by Jim Vaughn
    • It’s big!
I wish it weren’t so big. Even if it had a clip it’s too big for my top pocket. Magnets are weak. The magnets might be strong enough if the tool wasn’t so big. I also have found a tool not to be very durable. I owned it for three weeks. I dropped it on the floor from a distance of 3 feet and a liquid crystal display is all screwed up. I am currently looking for a different tool ... show more
Reviewed in the United States on July 15, 2024 by James mcnulty

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