The MT145 is a 20m Laser Distance Meter with bluetooth capable of measuring lengths up to 20m, designed to provide high accuracy. This is a one person measuring tool ideal for measuring remote and difficult to reach places. The meter measuring units of metres (m), inches (in) and feet (ft) with a continuous measurement mode where readings are updated approximately every 0.5 seconds. The Bluetooth function allows the user to transmit data to the Android or iOS mobile App for viewing, organizing and sharing recordings. The IP54 double moulded rubber case is splash proof and dust resistant. Accessories: 2x AAA Batteries Instruction Manual Features: Unit selectable (m, ft, in) Area, Volume Calculations Continuous Measurement Min/Max Distance Tracking Bluetooth 4.0 with APP support Reference level selectable Display illumination and 3-line display. Buzzer indication IP54 Splash Proof & Dust Resistant