Johnson 40-6211 Magnetic Sheave Alignment Laser with GreenBrite TechnologyGeneral Information Brand Johnson Part Number 40 6211 Product Type Magnetic Sheave Alignment Laser What's Included 2 "AA" alkaline batteries UPC 049448062119 California Residents Proposition 65 Warning Physical Characteristics Weight 1. 56 kg 3. 44 lb Details Features Accurate drivetrain alignment to reduce power losses, friction, bearing wear and noise Detects all methods of drivetrain misalignment including offset, angle and twist Rare earth magnets