Laser Distance Meter Fast Accurate Measurement Handheld Infrared Laser Measure Gauge 630 to 670nm 50m / 164ft Item Type: Laser Distance Meter Material: ABS Distance Measurement Accuracy: ± 2mm Measurement Unit: m, in, ft Continuous Measurement Function: Yes Area Volume Measurement: Yes Pythagory Measurement Function: Yes Addition and Subtraction Measurement Function: Yes Area Volume Plus or Minus: Yes Peak Size: Yes Self Calibration Function: Yes Laser Class: II Laser Type Level: 2 grade 630 to 670nm, less than 1mW Number of Stored Records: 99 Automatically cut off the laser for 20 seconds Automatic shutdown : 150 seconds Sound Prompt: Yes Storage Temperature Range: - 20 ℃ to 60 ℃ Operating Temperature Range: 0 ℃ to 40 ℃ Storage Humidity: 20% to 80% RH Power Supply Battery: 2 x AAA alkaline dry battery (shipped without battery)