DECREASED VIBRATION: This Johnson Magnetic Sheave Laser is designed to offer a high accuracy level ranging from +/- 1/6 in. to 10 ft. It is made to decrease vibrations on pulleys and sheave systems; helping minimize wear on belts and motor bearings. SECURE FITTING: The alignment level tool features rare earth magnets that ensure a secure attachment to ferrous metals; allowing quicker and safer set up. The strong magnets offer accurate alignment for reduced noise and abrasion. COMPACT SIZE: Featuring three laser targets; the magnetic aligning tool easily adjusts to various width sheaves for versatility. The compact size of the tool also makes it easy to use on sheaves with a small diameter. APPLICATION: This sheave laser has a red laser wavelength of 635nm+/-10nm to quickly check height and flatness of gear box and motor mounting plates. It is also suitable for various alignment jobs on sprockets; rollers and other plant equipment. PRODUCT SPECIFICATIONS: This Red Sheave Alignment Kit is powered by 2 "AAA" alkaline batteries (included) and has a battery life of up to 10 hours. It comes packed in a hard case for protection and easy carrying.