Digital Distance Meter Laser High Definition Screen High Accuracy Industrial Long Distance Measuring Instrument(LDMM50 ) Item Type: Distance Tester Screen Size: 2.4 Inches Measurement Accuracy: ±2mm / 0.1in Unit of Measurement: M, In, F, Ft / In Measuring Time: 7 Times Per Second Laser Type: 620-690nm, <1mw Laser Category: Class 2 Protection Level: IP54 Data Storage: The First 50 Values Laser Automatically Turns Off: After 30 Seconds Automatic Power Off: After 180 Seconds Working Temperature: 0°C-40°C Storage Temperature: -20°C-70°C Multi-Line Display: 4-Line Display Weight: Approx. 217g / 7.7oz Colour: Black Power Supply: 2xAA Batteries (Batteries Not Included) Material: Plastic Measuring Range: 0.05-50m Functions: Area Measurement, Volume Measurement, Pythagorean Measurement, Buzzer Indication Avoiding Misoperation, Angle Assistance, Plus/Minus Function, Continuous Measurement, Buzzer, Maximum/Minimum Value, High-Definition for OLED Screen, Up to 50 Sets of Stored Data, Anti-Skid , Drop-Proof, Strong and Durable.