Leak detectors are used in mechanical, automotive, petrochemical, wastewater treatment, plumbing, electrical, heating, ventilation, and air conditioning (HVAC) applications to locate the source of leaking gas or liquid. Simple leak detectors use dyes, pH- or chemically-reactive indicators, or a foaming substance to find leaks in pipes, tubes, fittings, tanks, and cylinders. More complex leak detectors have electronic sensors that measure the concentration of leaked gas or liquid in an area to pinpoint the source of leaks, determine the type of gas present, monitor air quality, and detect electrical corona or failing valves, bearings, and solenoids.

Bacharach manufactures instruments for the measurement and detection of gases and liquids, including combustion analyzers, fixed gas monitors, and leak detectors for the HVAC industry.