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There is variety of warning device and fire fighting equipment that is made available for a variety of applications in the market. Gas detectors a safety equipment respond to propane gas, natural gas, lp gas tank leak and also if they are unburned. Flow rate alarms detect flow rate of gasoline, compressed gas, water, nitrogen, chemicals, etc. They are used in mobile hydraulic equipment, industrial process control instruments. The security cameras like bullet camera, wireless security camera, spy camera installed at home and in commercial areas are matters of evidence of anything recorded. If there is a cliff ahead or a danger zone, a three-sided barrier and chain holding cones are useful. Epirbs are used for maritime emergencies, elts are used in aircraft applications and plbs are used for personal use. These are tracking transmitters. Safety edges and safety bumpers are machine-protecting equipments that sense changes in pressure which prevent damage to machines and the surrounding. Glow sign stickers, revolving warning lights mounted on police cars and ambulances present visual warning signals.
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