Usage Tips:OfficialParts Specialist Since 2016 Trusted by 120,3512+ European drivers, explore our certified accessories collection directly from the seller profile. nlet Connector: QCC1/Type1 ProductDetails:2PCS Propane Tank Gauge Materials: solid brass + plastic NOTICE!!! Will not read levels immediately: begins working when propane is flowing.Provides excess flow protection in case of a broken gas line and thermal protection in case of fire. To use it as a leak tester, you turn off all propane appliances, open and close the tank, then wait a while to see if the pressure goes down. If it does, you know you have a leak. The propane tank gauge level indicator is helpful to monitor the LP tanks, no more running out halfway through cooking. And it is nice to use when troubleshooting, if you have a poor flame, but this propane tank gauge is in the green, therefore your problem must be elsewhere if your tank has gas. It also can be used as a leak detector, just turn off all propane appliances, open and close the tank, then wait a while to see if the pressure goes down. If it does, you have leak. For your safety All propane appliances like gas grills, lanterns, heaters and stoves are outdoor use. Fully tightened at both propane tank side and grill side before using on your propane appliances to prevent leakage.