The stanley® slm65 20m laser distance meter is suitable for professional measurement applications. it features two-button operation: one button to activate the device and take measurements, and the other to select different functions. the gray lcd screen with black digits and dual-height measurement system allow for measurements from either the top or the base of the unit, providing accuracy and flexibility in a variety of measurement scenarios. it has been subjected to a 1m drop test to ensure its durability against bumps and drops. automatic shutdown after 120 sec and screen after 180 sec