The Bosch GLM 42 is a professional-grade, laser measuring device with a host of applications. The device can determine the distance between two points. It can also work as a continuous measurement tool like a traditional tape measure. It is accurate to 1/16 inch. This measuring device can store up to ten measurements, and its digital screen makes it easy to read. With its dimensions of 5.5 x 2 x 7 inches, the device is compact and portable.