... life battery. 3. Illumination of display. laser distance meter PD 54Brand: RUIDE Model: PD23, PD54, PD56, ... displaymeasurementContinuous Measurement, Pythagoras Measurement, Plane Area Measurement, Volume MeasurementAddition / grand totalAvailableBattery life, Type AAA, 2 ... Illumination of display measurement Continuous, Pythagorean Surface area, volume measurement Addition / grand total √ Battery life, ...