Flowtech offer Float & Board Type Tank Level gauge (indicator) suitable for large non - pressurized liquid storage tanks / vessels. This gauge is also applicable to cone roof, float roof, floating roof, under grand tanks etc. The Specific Gravity of the fluid should be more than 0.6(Free Flow) This level gauge wonks on the principle of buoyancy. The whole unit consist of two type of parts. Viz wetted parts & Non-wetted parts. Wetted parts are those which comes in contact with the liquid e.g. Float anchor plan float guide wire etc while. Non-wetted parts are the one which do not come in contact with the liquid e.g. Float wire, Mountain Breakers indicator pulley, pulley hosing scale, indicator etc.