The LD 1 is a Air Quality Meter for refrigerants and freon in high technology that detects all types of gases based on CFC or HFC. Thanks to the sensitivity of this Air Quality Meter, it can detect gases from refrigeration systems even in areas contaminated by other gases. The Air Quality Meter uses acoustic and visual alarms when it detects as leak. The goose neck sensor cable allows access to hard to reach places. The sensor has a lifespan of at least a year, which means it doesn't require a recalibration. Replacement sensors can be ordered from us if necessary.