RKI Instruments RI-415 is a portable gas detector used to detect gases such as HC gas, vapors and methane gas. It has two auto-ranging modes (0-100 vol% or 0-100% LEL) and an adjustable alarm, as well as a display showing both current gas concentration and peak value. The RI-415 is equipped with a pump to draw in gas samples and a filter to prevent dust, water and oil from entering the instrument. It has a carrying case and comes with a sampling hose and probe.