To use, place on a tripod and set it approximately level. The built-in compensator automatically sets the horizontal plane and the laser rotor starts revolving immediately. If tilted or jarred beyond its self-leveling range, the rotation and laser beam stop automatically and a warning light flashes.This makes it the superior method for dampening the effects of vibrations and rough use to ensure that you're always working with a stable, accurate beam even in extreme temperatures. Spectra LL500 is designed so that any crewmember can easily perform precise, error-free grade checking with reduced manpower and speedier setups. Spectra's waterproof housing ensures maximum productivity anytime, anywhere. Spectra Precision LL500 laser level. Spectra Precision HL700 laser detector. All items are packed to the requirements of the carrier. SPECTRA PRECISION LL500 + HL700 ROTARY LASER LEVEL, TRANSIT, LASERPLANE" is in sale since Monday, November 13, 2017. This item is in the category "Business & Industrial\Test, Measurement & Inspection\Levels & Surveying Equipment\Levels & Autolevels\Rotary Lasers". The seller is "topcon-sokkia" and is located in Spokane, Washington. This item can be shipped worldwide.