The ML-400G maximum visibility under direct sunlight, its ultra-bright green laser line up to 120 degrees, excellent stability even at extreme temperatures, and a flexible adjustable housing. Built-in tempered glass window and waterproof feature can protect under all weather and sawdust damage from sawmill. It projects a visible green guide line up to 100 feet long (at the distance of 29 feet) - suitable for large work surfaces. It can be used as a guideline for use in alignment, machine vision systems, construction, and process control and is ideal for all kind of large-field cutting and alignment applications, even under a bright surrounding condition indoor and at extreme temperatures! The ML-400G will increase your accuracy for many applications, such as industry floor marking, big pipe connections, stone, lumber, textile cutting and press brake, surface grinder and tire manufacturing alignment. Compact & lightweight features make it very convenient to mount the ML-400G to a worktable or a cutting machine - saving you time. Direct Green Laser Diode: new revolution in green laser technology The new revolution in green laser technology provides excellent stability even at extreme temperatures! A laser line generator is only as good as the lines it produces in any application, any time. In the past, the bad news for green laser products is that they are more sensitive to extreme temperatures than red lasers, but not anymore. If you try this ML-400G, you will find out that our green lasers have excellent stability even at extreme temperatures. Built-in revolutionary direct green laser diode makes the output power of its laser steady. The operating temperature range of the ML-400G is from -4 °F (-20 °C) to 140 °F (60 °C), which is a huge spread.