Automatic tank gauges SP300 RS485, 2'' Oil floater kits, magnetic probe with 0.5mm accuracy, 316 stainless steel, IP67 protect Automatic tank gauges SP300SP300 ... represent the high quality in application for underground tank measurement.Features:- Use for gasoline, diesel and other ... get probe length? Following data are necessary,D -Tank diameterH1- height of manholeH2- height of riser pipePCR ...