Refrigerant Information: Name: R134a R22 Household Refrigerant Air Conditioning Car Air Conditioning Tool Kit Common Cool Gas Meter Note: Do not use too much force when charging the bottle opener. This will deform the rubber pad inside the bottle opener and the gas will not come out. Tighten with normal force. If refrigerant is added, the pressure gauge indicator is about 8-13, that is, the air conditioning compressor is not working and the air conditioner needs to be checked.1. The air conditioner can be in cooling state normally. Do the two external connectors have water drops when the air conditioner runs for a while? Yes, normally; One with or without, no refrigerant; No, there is no refrigerant.2. Open the inner cover, take out the filter, there are water drops inside the copper tube, normal; White frost, lack of refrigerant; Nothing, no refrigerant. R22 filling pressure value: look at the outermost wheel (0-15) black dial number, add pressure to 4-5 pressure! R134A filling pressure value: look at the outermost wheel (0-15) black number dial, add pressure to 2.5 pressure!Instructions:1. Set the air conditioner to cooling mode and the temperature to the lowest.2. Check if the air conditioner is working properly.3. Check if the compressor starts normally.4. After checking, connect the refrigerant adding device to the side of the air conditioner with a low pressure valve.5. Check the test pressure. If it is not normal, it should be repaired.6. Add refrigerant. Packing list: 466 inch refrigerant addition meter * 1 Refrigerant adding tube * 2 Adapter * 1