TOPCON 1051612-09 - RL-HV1S Self-Leveling Single Grade Rechargeable Laser w/ LS-100D Receiver and Bluetooth ControlSINGLE SLOPE, LONG RANGE, SELF LEVELING LASER The Topcon RL HV1S Single Grade Laser is an economical and user friendly laser that is built for single slope and layout applications. With a working range up to 2,600 feet, this laser is ideal for land surveying, geospatial monitoring, civil engineering works and other site works. The RL HV1S offers an accuracy of 10 arc seconds and a single grade range of 5 percent. Self leveling within 5 degrees