DO NOT waste your money. Cannot trust results from this device. Used a brand new air conditioner to evacuate and refuel a car that arrived at the shop with no refrigerant. Filled system from a new 30 lb canister. I wanted to try the device, see how it works. Follow the connection instructions. The device said that the machine is out of order! How can a virgin 134a fail? Now I only get an error message from the device. The grateful Revane allowed me to return!
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