Laser Distance Measure, BEBONCOOL Handheld Digital Distance Meter with LCD Backlight for Distance, Area, Volume and Pythagoras theorem Measurement MULTIPLE MEASUREMENT FEATURES - Area, distance, length, volume, continuous measurement, Pythagorean method-three points; Addition and subtraction; Low battery indication; 20 groups data memory; Manually delete data; Auto shut down after 150s without any operation to save power INTELLEGENT DESIGN - Mute setting allows measuring for indoor places where quiet work. Memory function makes easy to read last 20 records. IP54 waterproof and dust-proof protect the digital laser measurement to the maximum extent EASY TO USE - Easy addition/subtraction of measurement. Set up front/rear benchmark. Switchable among meter (m), inch (in), feet (ft.), utomatic calculation of area and volume. Auto correction and error report technology. Large LCD with backlight WIDELY USAGE - Widely used in construction and industries, especially in large areas such as rooms, apartments, buildings, real estates, factories, warehouses, etc WHAT YOU GET - You get a Laser Measuring Device 196Ft with the laser Type: Red laser, 635nm, &lt;1mW, Class II ; with extra belt Clip, Hand Strap, ususal muanul adn Package Box, 3 Years warranty to make you satisfaction The indirect height measurement uses Pythagoras to measure distances even when point A and/or point B are not accessible for linear measurement. A memory unit stores the last five measurements and the 2-line backlit display helps improve screen visibility in both dim and bright conditions. Th e operating range is up to 131ft with accuracy within 1/16 of an inch (1.5mm). Bottom measuring datum Top measuring datum