Portable, compact design with a durable powder-coated aluminum body and brass fittings. Waterproof and shock-resistant. 4 super strong rare earth magnets for ultimate holding power. V-groove design for pipe and conduit mounting. (3) 45 minute arc vials: Oversized full view 0 deg., 45 deg., and 90 deg. Easy-to-read graphics with inch scale. Laser diode is Class IIa. Accurate up to 1/4" at 100' and lasts up to 10,000 hours. Length: 8.25".