1、Portable laser distance meter with spirit level on the right, measure any distance from 0.05mm to 40 meters, easily, quickly and with high accuracy 2、Mini laser distance with multi-functions, measuring unit switch, single distance measuring, continuous measuring, measurement of area, volume, pythagoras, addition or subtraction 3、Self-calibration function. With adjusting range of -9 to 9mm, keeping the precision of the device 4、Save and browse function. The measuring result can be automatically saved to the memory stick and you can read the saved date or remove all history records 5、Application: interior design and construction, traffic accident site, estate development and assessment, public facilities planning, landscape, telecommunications industry Description: SW-40 is a professional handheld laser distance meter, it has the advantages of compact size, complete functions, accurate measurement, simple operation, a slight press that can quickly achieve the area, volume, timing, lofting measurement, satisfy your different needs in various complex environments. Features: Large LCD digital display with backlight that makes reading more clear and visually in dark areas. Portable laser distance meter with spirit level on the right, measure any distance from 0.05mm to 40 meters, easily, quickly and with high accuracy. Mini laser distance with multi-functions, measuring unit switch, single distance measuring, continuous measuring, measurement of area, volume, pythagoras, addition or subtraction. Self-calibration function. With adjusting range of -9 to 9mm, keeping the precision of the device.  Save and browse function. The measuring result can be automatically saved to the memory stick and you can read the saved date or remove all history records. Comes with a portable pouch and a hand strap, which makes it easy to be taken anywhere or to be stored for next time use.  Application: interior design and construction, traffic accident site, estate development and assessment, public facilities planning, landscape, telecommunications industry. Specification: Model SW-40 Laser Distance 40m Accuracy ± 1.5mm  Laser Level 635nm Class II Measurement Unit m/in/ft Features Single Measurement Yes Continuous Measurement Yes Automatic Calibration Yes Addition/Subtraction Yes Area/Volume/Pythagorean Measurement Yes Timing Function Yes Lofting Measurement Yes Maximum /Minimum Yes Extension Bar Yes Horizontal Bubble Yes Data Storage 100 Auto Laser Off 20s Auto Power Off 150s Working Temperature 0℃-40℃ Storage Temperature -20℃-60℃ Storage Humidity RH85% Characteristics Material Plastic, Metal Color Color: Black + Green Power 1.5V 2 * AAA battery Product Size(appr.） 118 * 54 * 26.5mm / 4.6 * 2.1 * 1.0inch Package Weight(appr.) 262g Accessories Pouch, Strap, User Manual Package Included: 1 * Laser Distance Meter (Battery is Not Included) 1 * Strap 1 * Pouch 1 * User Manual