Here's the perfect tool when straight lines or accurate measurements are important. Three ways to measure: plumb, level and 45° angle. The 8' locking tape measure has the standard and metric measure, as well as the rulers on each side of the laser. The tape measure is 1/2" scale with 1/32" increments. There are horizontal and vertical laser markings with a power on/off switch to save battery life. The laser is a class 3A laser. The level comes with three LR44 batteries.