Flip-up display for easy viewing from any position * Built-in level display using Dead Level Technology TM is always visible and permanently stored. * ?HOLD? feature allows you take a reading and hold the value while you move the gauge to a new position. * The machined aluminum base imbedded with high strength magnets sits perfectly flat for optimum accuracy. It also has a built in ?V? groove for use on pipes or conduit. * AAA batteries for super long life