laser measuring Device ST80 Stony Laser level Device, the layout tool of professional choice for indoor and outdoor applications, including aligning points, checking level and plumb, and squaring operations with greater precision and consistency with a single person operating a single tool. - 14mm Receiving Lens - 20 Memories Recall - Advanced Measuring Applications - Pythagoras To Measure Distances & Height Measurement - Accurate Calculations of Area and Volume - Automatic Counting - Dark Mode with Stony Flash Light Screen - Compact Size - Professional Stony Marker Pen Measure Range / 0.05M~80M Resolution / 0.001M Accuracy / ±2mm Measure Speed / 0.5 sec. Laser Type / 650 nm, Class 2, <1mW Beam Size / 25mm @ 15M Battery / 2 x AAA Battery Battery Life: Up to 10,000 measures Dimension / 113 x 47.5 x 30.2 mm Operation Temprature / -5°C~40°C Storage Temperature / -20°C~60°C Laser / 30 seconds Device / 180 seconds