I have a JB Prowler can't find even large leaks, A D-TEC Inficon NI-CD rechargeable, a Yogokawa H10G, a GE H10B... now these H10s dont really do anything other than CFCs and HCFCs well likely because they are rather older technology (pre 93)... I recently got the Fieldpiece heated diode detector and when leak searching for 410a it still doesn't get a result like the H10 did... I really dont want to resort to recovery, R 22trace+N to leak search every time. I still hear guys in the field going back to the H10 but its usually the battery operated one. I dont mind a plug in one if it works best. I noted two models, the H10 and the H10PM whats the difference? Does it make any difference if its a Mars or Bacharach?...
When it was R12 ,22 &502 the leak searches were a lot easier. I couldn't use halide being color blind. although I have one.

 

you can always put dye in the system and check it with a black light. big blue soap works my H10 works on 410 did you try changing your tip. pressurize the system to 200pgig you'll find it

 

Any idea the difference between an H10 an H10b, an H10G, an H10pm? Many of the leaks I actually find I either hear or feel with my hands.