Ballast checkers are intended to reduce time in determining what technology a fluorescent lighting system's ballast is using. They can I.D. the type of being used from up to 15-feet away by simply pointing the ballast checker at the fixture. If it is utilizing the old magnetic ballast the status indicator light will turn orange, however if its using an electronic ballast the indicator light will turn green. The days of running up and down ladders to determine how it's being powered are over, with the convenience of handy ballast checkers.