• Three 45 minute arc vials 0, 45, and 90 degree; accurate up to 1/4 at 100"; lasts up to 10,000 hours; v-groove design for pipe and conduit mounting; three dimensionally hand designed and calibrated to be accurate on all planes; powder coated for a more d • and 90 degree; accurate up to 1/4 at 100"; lasts up to 10 000 hours; v-groove design for pipe and conduit mounting; three dimensionally hand designed and calibrated to be accurate on all planes; powder coated for a more d urable finish; a