1The millimeterlevel accuracy dial accurately positions the vertical line to reduce errors and improve work efficiency. 2Low refraction, good light transmission, use. Optical glass, high transmittance and no other variegated colors 3The flexible multimechanism pendulum body has passed strict balance tests to ensure the pendulum is stable and accurate even if it vibrates randomly. 4The equipment will be selfleveling, put the line level on a more level place, and automatically level within an inclination of <4. 5Multiple protection performance is more stable, protection grade IP5 Suitable for wall construction, photo hanging, etc. 6The light source is thin, the penetrating power is strong, the eyes are clear, not blurry, and not dazzling. The locking mechanism protects internal parts and allows manual mode.