The GDI Sentinel Instrument is a multi-gas detection instrument that can measure up to 4 gases in combination. It offers up to 16-hour continuous battery life with battery life indicator. The Sentinel is equipped with Inductive charging (no contact points that can corrode) The instrument is also designed with Rubber over moulding for increased durability and is shock absorbent. The Sentinel multi gas instrument utilizes wireless data communication and downloading. The GDI Sentinel also offers Location monitoring, Fire/guard patrol function, Gas detection vehicle interlocking, Gas alarm broadcast to cap lamps, Over the air ﬁrmware and software updates “wireless” and Up to 16 000 gas event storage. The instrument is user friendly and complies to all the MHSC and DMRE requirements.