The Mastech MS6310 is a portable gas leak detector designed to detect various gases including natural gas, methane, propane, butane, acetone, alcohol, ammonia, hydrogen, gasoline steam, sulfide, organic solvent steam, smoke, paint thinner, naphtha, and volatile industrial solvents. It is suitable for industrial and commercial use, offering reliable gas detection capabilities to ensure safety and prevent potential hazards. This unit is a versatile tool for monitoring gas leaks in different environments. New, open box. Box has light corner wear. Requires (4) AA Batteries, not included. See pictures.