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- 27 Jan 2008
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We had two of the pen lamp testers issued. The one without batteries would trip an RCD if voltage to earth measured the other with batteries would not. The one with batteries had buzzer and light continuity which I would have said better would have been called insulation testing as it would activate with a really high resistance. Since it used batteries could not really use to prove dead too easy to have bad connection or flat batteries. The one without batteries I filled with re-enterable compound and used underground in extreme wet conditions and was very happy with. The one with batteries was hardly ever used.