Uflex Water Tank Gauge in Black 4-47262

Uflex 60520LK black water level gauge, empty measuring (E), half (1/2), full (F). White graphics and black bezel metric European style scale 0-190 ohm with hole size 52mm (2.04"). Measuring the depth of water in the tank and converting that to a resistance value sent to the gauge, displaying empty to full.