In order to check the timing setings of your ignition system, a stroboscope or so called “timing light” is a very usefull tool. Many of these devices are to be externally powered which can be a handicap when using the tool in an industrial environment like at industrial stationary engines where the engine battery is not always easily accessible. Timing light model #130 is an easy to use - inductive clamp - timing light, built with quality to last. There is no need to connect to a 12/24 volt battery for power. This unit is powered by two R20 cell flashlight batteries. It’s a great tool for marine, industrial, racing engines and other small engine timing.