I have one of the 5-6 year old Flukes, F or C is an internal switch, uses a 9volt - I've dropped it on concrete from about 3 feet, battery and cover came off - put it back together and worked fine.
Earlier HF one with two buttons and trigger, remembers which (F or C) you had last - no longer available. Rats...
3 of the current crop of 1 button versions, have to push the button after you turn it on EVERY TIME, or it will read in C.
Used to have 4 of those, don't recommend dropping them on ANYTHING (ever play the game "operation" ?

And yes, the patient DIED...
No complaints about accuracy, and at $25 on sale the HF is hard to beat.
All but the pretty expensive ones are fixed emissivity, meaning they will read closer to actual temp on some materials than others. Shiny

or dull, clean or rusty, flat black or gloss yellow, all can make a difference from an actual contact thermocouple reading - but usually not much, and if your usage is typical you'll be looking for temp DIFFERENCES more than actual.
Most seem to have either 10:1 or 12:1 beam, meaning that if you are 10" (or 12", depending) away, the target area will be 1" dia. - This can really screw you up for some things, so it's important to keep in mind. (Hint - just because the LASER dot is 3/8" across, does NOT mean that's all you're measuring

)
I got more, but you probably won't be buying the $5000 instruments it applies to... Steve