Topcons RL-SV2S strength is its versatility - perfect for horizontal, vertical or sloped interior or exterior applications. Featuring fast self leveling, setting slopes up to -5% in X or Y axis is easy, or turn it on its side and use it for vertical layout and alignment applications. The RL-SV2S offers an operating range of over 2,600 ft. (800 m) diameter to cover even the biggest projects, and with an operating time of 120 hours on alkaline batteries this laser will still be working long after others have quit. Warning: This product can expose you to chemicals which is [are] known to the State of California to cause cancer and birth defects or other reproductive harm. Warning: This product can expose you to chemicals which is [are] known to the State of California to cause cancer and birth defects or other reproductive harm.