"When you need a tough PipeLaser for harsh jobsite conditions, CST/berger has the one to use. It's designed for demanding locations like underground drainage and construction sites, where elements can be tough on equipment. Constructed from cast-aluminum and nitrogen purged, the LPML20 is sealed for total waterproofing. All interior components are protected with a rugged aluminum housing to stand up to the demands of the underground industry. 2-way RF remote control gives real-time data between remote and PipeLaser and lets you make changes without being in the hole. Also provides full-function capability to control all the menus and functions of the PipeLaser. U.S.A. Common Usage Pipe laser, Remote Length ft. 800, Indicator Type Battery indicator, Battery Type Ni-MH, Battery Included Yes, Range ft. 800, Accuracy 10 arc seconds, Grade Capability -15-40, Display Type LCD. Laser diode 635nm-650nm Power Rechargeable Ni-MH battery pack, alkaline batteries or 12V external power cord Operating temperature -4F to 122F -20C to 50C Illuminated LED pivot point Grade and line lock Multi-function menus Wireless two-way RF remote control Cross-line range 15 Cross-axis self-leveling Auto-line centering Auto-grade zoning Sleep mode Password protection of functions"