The Spectra Precision® Laser HR320 is a durable laser receiver for exterior leveling applications. LCDs on the front and back display a 5 segment grade arrow that indicates grade position. A loud beeper is designed to be heard on noisy job sites. Fine and medium accuracies are selectable to meet various applications and conditions. Applications: Checking and setting elevations for smaller jobsites, leveling forms and footers, and estimating cuts and fills. This tool is ideal for decks, terraces, pools, and septic systems. HR320 Features & Benefits Large easy-to-read LCD on front and rear makes it ideal for exterior applications Snap in rod clamp allows fast switching from rod-mounted to handheld applications Rugged waterproof housings withstands 5 ft (1.5 m) drops and protect the unit from moisture and dust Two on-grade sensitivities (fine and medium) let you get to grade faster in a variety of applications 100 db loud speaker can be easily heard on noisy job sites