The H10g/pm are my go to detectors. I've had the pleasure of using the Zx-1 and YJ accuprobe. They both worked well in the first 3 months but started dropping off in performance until failure. Kinda scar'd now from those type of plastic bodied sniffers. I rarely work with 410a but the h10 family has yet to let me down on a 410a leak. False hits on h10's are close to none. It's been observed when walking into a bakery chill with moving product and rising dough, it will quickly false alarm and then stabilize.
The FP IR looks to be something I'd like to invest in. Though it seems on a couple videos that the sensor is almost touching the reference leaks. Do you normally have to be close with the IR? Can you stand a couple feet from a coil with a slow swinging motion and still get the general area where the leak exist? In the videos it seems that the FP IR refrigerant detector have an air pump which depends on sucking up praticulates. When I think of IR, Flir or Fluke imagers come to mind. Are there lenses inside the FP that detect IR after particulates hit the filter? Really interesting stuff.