Designed to detect laser beams generated from crossline lasers, the Spectra Precision HR220 is compatible with the 5.2XL, 1.3XL and 1.5PL. The HR220 can be used to extend the indoor working range of these lasers as well as increase the versatility allowed by outdoor use. The HR220 features a large front LCD display and a rear-corner Red-Green-Blue LED display as well as dual horizontal and vertical level bubbles. The loud, audible signal can be set to loud, low or off. The HR220 ships with a rod clamp that easily attaches to grade rods.