This multi-functional measurement meet the needs of people with different usage scenarios like construction, remodelling, renovation and room decor.Specifications:Model: DC40, DC60, DC80, DC100 (Optional)Material: ABSMeasuring Range:DC40: 0.05~40mDC60: 0.05~60mDC80: 0.05~80mDC100: 0.05~100mAccuracy: 2mmUnit of Distance: m, ft, inUnit of Area: m, ft, inSingle Measurement: YesContinuous Measurement(Max/Min): YesArea/Volume/Pythagoras: YesPlus and Minus: YesUnit Conversion: YesData Clear: YesError Code: YesBattery Power Indication: YesMeasuring Reference: YesAngle Measurement: YesSingle Measurement Time: 0.25s Auto Switch Off: 30sInstrument Auto Switch Off: 180sHistorical Data: 100 sets Type: 620~690nm Class: Class II, ＜1mWOperating Temperature: 0~40Storage Temperature: -20~65Storage Humidity: 20~80%RHPower Supply: 2* 1.5V AAA batteriesWorking Time: ＞5000 timeItem Size: 112* 45* 25.5mm/ 4.41* 1.77* 1.00inItem Weight: 82g/ 2.89ozPackage Weight: 170g/ 5.99ozPackage Size: 17* 11.5* 4.5cm/ 6.69* 4.53* 1.77inPackage List:1* Distance Meter1* Hand Strap2* 1.5V AAA Batteries1* User Manual(English)