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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.
ALE
2025-08-30 14:42:13
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
HK
2025-08-17 13:40:09
Real-time temp readings. Magnets on the back sticks to the duct. What’s not to like. Simple design. Love it
Mike R.
2025-08-16 10:34:59
I use this for checking the split system in my home. It works perfectly and was recommended by the a/c technician that was servicing the unit. A no brainer if you are looking for something like this.
Chase
2025-08-09 18:59:51
The large display on these probes are much easier to read, as an residential hvac tech I use these probes several times a day checking TDs. The green backlight is nice also for dark spaces. These probes are accurate and react quickly to temperature change. Only issue I’ve had is I dropped one of them about 6’ to a garage floor and now part of the display doesn’t show.. my fault tho honestly
Christina
2025-08-02 17:17:21
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.
Chris Jones
2025-06-19 17:18:27
Good thermometer if you need temperature differential.
Douglas Eby
2025-06-10 15:35:45
The numbers are easy to read from a distance. Fits well iny tool bag. The flip out probe is handy for different positions. I can stick to ceiling vent and have probe in vent or parallel.
James mcnulty
2025-02-05 13:00:00
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
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