I am in the market for a leak detector. I am still kinda new in the field so I am looking for recommendations. One thing tho....I will NOT be purchasing anything from Inficon!!! I bought a Whisper and tried it on over 5 different leaks and it didn't pick up a thing. When I tried it return it to my local United Refrigeration they said it couldn't be returned because it had been used. How was I supposed to know it doesn't work without using it!! I've tried calling Inficon but they say it works fine even tho it obviously doesn't. So now I have to purchase a new leak detector so I am looking for advice. I would like to have one that runs on batteries and will detect 22 and 410A. Thanks in advance for any help.