The LM-500 closely meets ISO standards with its green measuring light that instantly detects the reading point and direction without the need to move around the system. Single-vision lens to progressive lens are easily detected with its LCD monitor. The monitor is 3.5-inches and the display comes in color and offers clear visibility when conducting readings. Designed with high technology features, the device is both compact and light weight making it easy to move around without taking up excess storage or space. Its full graphic LCD makes it possible to choose various options according to specific needs. The cute design blends easily with all environments and the Hartmann Sensor can measure up to 108 points to give the user added flexibility when using the device.