Two laser lines: easier alignment with the GLL 20-22 G line laser, the horizontal laser line can be projected even further through the U-shaped window Precise results: for extremely precise measurements, the laser measuring device delivers results with an accuracy of ± 0.3 mm Precise results Dual power source: for more flexibility, the device can be used with a 3.7 V lithium-ion battery or with AA batteries via the battery adapter to avoid downtime Very robust: durable and rubber-reinforced housing with protection class IP65 to withstand dust and water Items included: GLL 20-22 G line laser, LB 10 bracket, laser target plate, protective bag, 2 x 1.5V LR6 batteries