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Got tired of trying to use a simple voltage tester with a tiny light bulb that is impossible to see in sunshine and forces you to take your eyes off the contact to look at the bulb...
went to radio shack for a small 12 volt buzzer for 2 bucks and replaced the bulb.
Works really slick. I don't shop the Snap-on or Mac trucks, but I don't remember seeing a setup like this for sale. Try it, if it works, send me a tip. :seeya