Review on 🌡️ CarBole HVAC Low & High Pressure Gauge - R410A R134A R22 Refrigerants | PSI KPA Air Conditioner by Chris Reeves

If you need a PT chart on your gauge, the first thing you should have is a CF conversion chart. This is a big problem and this manufacturer will probably never solve it. In addition, the calibration screw is stationary in the low pressure gauge. Mine is stuck at factory zero, which isn't exactly zero on the scale. On the other hand, the case is decent steel and has a fairly dense plastic-rubber coating, maybe silicone. They are large enough to easily read the pressure. And if a temperature scale is useless, always have a paper PT chart or application handy. Haven't tried them yet so can't comment on how accurate they are. I will not rely heavily on their reliability no matter what. In addition, it is a cheap set of sensors. It works out. These are NOT professional tools. But if you need something to practice with, are on a budget, or want a cheap spare in your tool bag, then it's definitely cheap.