With this 90° cross line laser from Kreators, you can project a cross line or a 90° laser line, making it easy to install your sink vertically. It is also possible to project both the cross line and the 90° laser line simultaneously. The device features a locking function, ensuring that your lines remain vertical even when changing direction. The laser lights up if you are no longer working horizontally, so you can always be confident in your measurements. The KRT706310 aligns itself within six seconds with an accuracy of 0.6 mm/meter. For the highest precision, you can also mount the laser on a tripod, such as the KRT706900. 2 AA batteries are included. Battery required: Yes. Number of batteries needed: 2. Batteries included (number): 2. Measurement range: 12. Measurement accuracy: 0.6. Storage type: BMC (blow-molded case). Volume function: No.