Goldbaltt Laser Measure - 100Ft Digital Tape Measurement for Distance Area Volume Pythagorean Calculation, Batteries Included Multi-function measure: addition/subtraction, area/volume, Pythagorean proposition, distance, length, Contiunous measurement, front/bottom measure base switch Stores up to 10 measurements, extreme accuracy, measures to within 1/8"(3 mm) Backlight screen for better visibility in dark areas Batteries included, lifetime warranty