· The PVG12V 7 ft topsoil screener is worlds most portable, compact and affordable soil, rock, dirt, sand, compost screener. This portable vibratory screener uses 12 volt deep cycle batteries to power our 4000 rpm vibratory motor. Our center pivoting spring loaded screen deck measures 4 ft x 7 ft, moving up and down 3 inches, while moving back 1 ...