GfG’s MICRO III is a compact single-gas detector with ATEX certification weighing just 75g, with dimensions of only 47x88x25mm. Ideal for personal protection, the unit detects oxygen, hydrogen or many toxic gases like hydrogen sulphide, ammonia, ozone, carbon monoxide, and more. Features include a large display and loud alarm of 95 dB.GfG Instrumentation, Inc., Ann Arbor, MI.