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
This is an Auction for a New in the Box, Amprobe Digital AC/DC Clamp-On Volt-Ohmmeter, Model AC/DC-1000A. Features AC/DC Volts to 600 AC/DC Amps to 1000 Ohms to 1999 In-rush Current capture (80mS response) Low Battery & Over-range indicators Withstands momentary overloads up to 50% Large, easy to read display
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