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hp 456a

  1. 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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