Water level indication is measured with a water level meter. Measuring artesian pressures requires a Bourdon Pressure Gauge to be connected to the top of the standpipe. The Standpipe piezometer is capable of measuring the borehole water level or water pressure at the piezometer tip. The water pressure at the filter tip is derived by measuring the height of the water surface in the riser pipe above the piezometer tip. This is achieved by installing a bentonite seal in between the sand filter zone and the backfill. Casagrande piezometers are used to detect, measure and monitor water pressure in permeable soil or rock specifìcally at the installed depth of the measuring tip. The water level can be read by portable water level meter or automatically with a pressure transducer inserted in the standpipe or connected to the filter to form a closed circuit piezometer.