HPC UEi 529 Gas Sniffer 529HPC UEi 529 Gas Sniffer 529 REVIEW Do you want a gas sniffer for your burner to check for leak? Purchase the HPC UEi 529 Gas Sniffer 529 now in Flame Authority! UEi 529 Gas Sniffer is originally part of the HPC Fireplace Diagnostic Kit but is a useful component by itself. The superior construction and design ensure a long lasting and quality product while the large digital display provides a quick and easy way to check for gas leaks. User friendly