Working great for R134a, R410a, R12 and R22
Very effective product as I tried to hunt down a leak in the A/C system in my car. It actually has 3 models and the first is really sensitive as I have to turn it down a bit. Not sure about the other ones, but it did really a perfect job on detecting R134a, R410a, R12 and R22. My favorite part about this device is the visual indicator as well as the tone which makes it extremly easy to use.