QY-688 4V4H 360 ° green laser level
2. Laser Source：Green Laser 532nm for Horizon (ClassⅡ)
3. Total Accuracy：±1mm / 10M
5. Auto-Leveling rang：±4°
6. Auto-Leveling system：Electronic servo-Motor ＆ Sensor
Four vertical red lights, 360° high- definition green light, and a mark, electronics auto-leveling. Can easily complete every kind of level and vertical line wiring, and extensively apply to indoor and outside carpentry, mire make, install pipeline, tiles, paint, decorate partition, water and electricity, install doors and windows
