Stanley Laser Distance Measurer 20M Laser Distance Measurer STHT77065-0About this Item:Range: from 20cm to 20mAccuracy ± 3mm at 10m. 1M impact drop tested – withstands knocks and dropsFunctions: distance, continuous measurement, area and volume calculation, addition and subtractionTwo-button operation, the ON button to take measurements, the second button to change the functionsTwo measurement points: base and front.