The AGATEC 11-0320 220GC Self-Leveling Horizontal Rotary Laser Level with Dual Manual Grade is fully automatic so there are no level screws or vials needed. Just set up the tripod, position the laser and turn it on. The AGATEC 220GC will level itself within its 5.7° self-leveling range and start spinning. The AGATEC 220GC will also alert the user should the instrument move out of its initial set up position when the H.I. (height of instrument) alert is activated.