BM822A Digital Clamp Meter Capacitance Temperature Frequency AC DC Multimeter Description: Digital Clamp Meter 33/4, the maximum display: 3999 Overload protection, automatic range Data maintained; peak hold Maximum jaw opening: 30mm DC voltage: 400m/4/40/400/600 V ± 1% ± 3 AC voltage: 4/40/400V/600 ± 1.5% ±
I googled the patent number and found the following info. The figures on the patent sketches looks slightly different than the piece. Patent number: US 3497806
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