Refrigerant leak detector

Does anyone have a recommendation for a reliable refrigerant leak detector?

After retiring my 120 v GE H10 (it still worked) more then 30 years ago, I bought the first generation Inficon D-TEK. That operated fine for almost 15 years, and then I bought generation 2 about 13 years ago and it was fine up until this year. I inquired about getting it repaired, it keep saying the sensor was bad, even though I replaced the sensor every year, but Inficon said that even if they had the parts to repair, it would cost as much as a new detector. So I bought the D- Tek 3 in May. Other then the battery when charged lasting a lot longer then the first two generations, it does not preform near as well as the previous models.

I had it for two months and was getting a sensor failure alarm, the rep sent me a new sensor but even then you can be on a unit and actually hear a slight leak the detector either won’t pick it up, or if it does and you want to hone in on the exact spot, it wouldn’t repeat and go off, even on the same sensitivity level. In my opinion it seems the quality of this particular model has dropped off. Any suggestions would be much appreciated. I use it on mostly R22, 410a, and 134A. Thanks to all