Spectra HL700 Laserometer, Rod Clamp With Circular Vial and Universal Multi-Language Operator&#39;s Manual Digital readout of elevation allows faster readings by displaying the exact numerical distance from grade, eliminating the need to move the receiver to get to "on-grade" Anti-Strobe Sensor stops construction strobe lights from setting off the receiver and eliminates phantom strikes for easier identification of true laser beam signals Large 5-inch (12.7 centimeter) reception height allows faster readings by acquiring the beam quickly and makes it easier to stay in the beam Construction site tough, withstands direct drops up to 10 ft (3 meters) onto concrete, durable in tough environments; less downtime due to damage or service requirements after accidental drops 60+-hour battery life with 2 AA batteries and variable automatic shutoff times, user is less likely to run out of power so it keeps working with no downtime due to power loss and reduces annual operating costs setup