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  1. T

    Best circuit tester

    I'm looking to purchase a good circuit tester. I need something to reach long distances and to be more specific as to know exactly which wire is at the other end. Any advice or first hand accounts are accepted. Lemme know. An I'm not looking for something like a 110 VAC circuit finder with...
  2. Maviday

    Vintage HP 456A current probe/clamp battery replacements.

    Hey guys. I inherited this wonderful little HP 456A current clamp a while back and I have been trying to find batteries for it with no avail. I have looked at the manual which states that it requires TWO TR 233, and ONE TR 234 Mallory mercury (stable discharge voltage) batteries. the...

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