Once in awile I re-calibrate The transit.Level it up and make small adjustments.I like to be able to spin it 360 degrees without the bubble moving.Then I set it beside a pond and take readings off the waters edge in 5 or 6 places to check the settings.I guess I could send it to a tech shop,But I dont know if they could set it any better.Standing water is pretty level.This would work on a laser to.