Spectra Precision HV101 Self Leveling Laser W /Tripod and LD-8 compatible Receiver. Automatic electronic self-leveling for level and plumb – turn it on and start working. High durability designed and warranted to take a 3 feet (1 meter) drop onto concrete with highly visible beam that is easy to see. Multiple scanning angles and rotating speeds to match various conditions, IP54 weatherproof sealing to withstand job site conditions. Built-in vertical stand and 5/8-by-11-inch horizontal and vertical mounting, manual slope control to match known references, uni-mount feature allows for application setups with no extra accessories.