Suitable with diesel, biodiesel, oils, water & AdBlue®.Readout can be sited up to 20m away from tank. Hydrostatic gauge.Universal tank adaptor 1”, 1½” & 2” M BSPP. Integral wall mounting holes.Digital display shows litres, cm & %.Suits tanks from 0‑4m diesel (water/AdBlue® 3.5m).Max tank volume 99,999L.Accuracy +/‑ 1cm (2m high tank +/‑0.5%, 4m high tank +/‑0.25%).Powered by a 9V battery (supplied) no need to remove front cover to replace.Battery bar shows remaining life.Suitable with linear, spherical & horizontal cylindrical tanks only.% alarm 0‑100% display flashes red & gives visual warning, no audible alarm.Display comes on after you press any button, gives tank level reading, has a backlight, times out after 60 seconds.Compatible with existing UNITOP/UNITEL gauge probes so upgrading is simple.Dimensions 188mm H x 100mm W x 65mm D.Important: if sited outside a weatherproof cover is needed.