The Bosch Professional GLM 20 laser measure is an easier, faster and more accurate way to measure. It delivers laser precision technology and real-time measurement mode, taking instant and reliable measurements up to 20 Mtr., so one person can size up the job in seconds. Square and compact by design, the BLAZE GLM 20 laser measure is ready for anywhere portability. It has a backlit display for easy viewing, even in dark areas. The laser measure is simple to operate, so users need only press one button to get accurate measurements to within 1/8 In., and press again to hold the measurement.