Klein Tools IR07 Dual IR/Probe Thermometer

That's exactly what the dual setup is for. The IR07 reads surface temperature with the infrared sensor and air or liquid temperature with the stainless steel probe, and it calculates differential temperature (T1-T2) for either mode, so you can take supply and return readings and let the tool do the subtraction. The probe has a hanging hook so it can sit in a vent hands free while you work.

Rated from -40 to 572 degrees Fahrenheit. That covers walk-in coolers and freezers at the low end and most steam piping, motor housings, and electrical terminations at the top. It reads in both Celsius and Fahrenheit with 0.1 degree display resolution. Anything hotter than 572 F needs a higher range instrument.

It is built for it within reason. The housing is ABS and polycarbonate, rated to survive a 2 meter drop, and carries an IP54 rating, which means protected against dust ingress and water splashing from any direction. That covers a fall from a step ladder, a dusty mechanical room, or light rain on a rooftop unit. IP54 is not submersion rated, so do not dunk it.

The probe on the IR07 stabilizes in under 20 seconds, so for air and liquid readings give it that long before you write the number down. The infrared side is effectively instant at under 500 milliseconds. If you are reading a duct and pull the probe after five seconds, you are reading a number that is still climbing.

The probe is stainless steel and FDA GRAS compliant, which is why it shows up in kitchen and food service MRO work as well as HVAC. It also has an easy-open design with a nub so your fingers do not transfer heat to the probe while you are deploying it, which matters when you are chasing a reading a couple of degrees either way.

Batteries are included. The IR07 ships with a pouch, owner's manual, and 2 AAA batteries, and it runs on 2 AAA, so there is nothing else to order to put it to work. The display is a backlit LCD with Hold, Max/Min, auto power off, and a low battery indicator.

Pick on what you measure. A plain IR gun only reads surface temperature, which is fine for scanning breakers, bearings, or a roof. The IR07 adds a stainless probe, so you can also get true air temperature inside a duct or the temperature of a liquid, readings infrared simply cannot take accurately. If your work is HVAC commissioning, delta-T checks, or anything involving fluid, the probe side earns its keep; if you only scan surfaces, you are paying for a feature you will not open.

It is a pocket format instrument, 5.82 inches long by 1.67 inches wide by 0.95 inches high, and it weighs 0.087 lbs. That fits a shirt pocket or a pouch on the belt rather than taking up a slot in the tool bag, which is the whole point of this one versus a pistol-grip IR gun.

It is certified to IEC EN 61326-1:2013 and EN 61326-2-3:2013, the electromagnetic compatibility standards for electrical equipment used in measurement and control. One safety note for any spec file: the target laser must never be aimed at eyes, as it can cause permanent damage.