Fluke 80PK-22 SureGrip Immersion Temperature Probe

Bought these for my Fluke52 thermometer to double-check my heat treating kiln. Turns out, my kiln is running a fair bit high. These probes will and do work at more than 1600 degF, as I have been profiling my kiln from 1400-1600 degF. Actual highest temp the meter has reported has been ~1638 degF (yes, the metal shield WILL glow reddish-orange at that temp). Clearly, you cannot put all of the probe into that kind of heat, since the rubbery/plastic handle cannot tolerate more than ~300F. My kiln allows me to run the probe through a hole in the firebrick door, with about 3-4 inches of probe shield inside the kiln, and about 2-3 inches of probe shield outside the kiln. I've touched the outside-the-kiln shield at 1600 degF internal temp, the outer part is not hot at all (a beauty of the Inconel shielding). The heat-exposed shield will turn colors at high temps, though--anywhere from bluish to grayish--but that is only to be expected.

This probe was perfect for my needs and very accurate.

I got this Fluke probe along with the 51 II meter. As an immersion probe this probably excels. However, it's also presented as a general purpose probe. In that capacity, when I used it to measure air temperature, it is accurate but very slow to arrive at the reading. After I saw that, I went ahead ordered the 80PK-24 Air Temperature Probe so I'll have both liquids and gases covered. These Fluke probes are not inexpensive but they appear designed for daily field use. If you have any of the Fluke digital thermometers, these are probably the probes you want to get.

Performs as one would expect. Two points to be aware of: 1) the rubber part of the thermocouple is NOT immersible up to its operating range – it would melt, and 2) this is for use in liquids or gels. Anecdotally, this product measures temperature somewhat slower than other high-end thermometers I've used, but since it's designed for prolonged exposure and immersion, "instant read" is not its primary function (although it does this pretty well).

I have ordered and used other type of probes and none have the same endurance and accuracy of fluke probes. I have tried the 30 to 50$ probes and handles get hot to the touch, but not the fluke, grip handle very comfortable doesn’t transfer the measuring temperature. Probe is bendable and responsive. I only just wish it was slightly cheaper, with a reduced price fluke would definitely sell more.