[Three Laser Rolls to One Laser] This laser rolls combined with 131ft/40m laser measurement and 16ft/5m tape measurements and 32ft/10m 90 cross wiring. Not precise enough. It is a laser roller[Automatic locking tape] The position will be automatically locked after the adhesive tape is removed. Just press the gray button to automatically bounce. It is very convenient and safe and will not hurt you. You can use your tape and clip to easily carry anywhere. Strong and durable and convenient carrying.[LED backlit screen and data storage] The large LED backlit screen can help you read laser spot numbers clearly even in bright environment or dark environment; storage up to 20 measured values, automatic laser tape measurements automatically turn off the power, power saves.[Multifunctional model] Digital laser tape channel for area measurement, volume measurement, Pythagorean measurement, double Pibagras measurement and cross laser to meet all your needs.[High precision] Laser measurement accuracy: +/- 2mm, which can be measured continuously. When moving, you can read the precise distance within the effective range. Class II laser output