Uploaded December 2022 | Updated September 2026, 1 week ago

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**** See addendum video:
youtu.be/sPCeqSZ7vtQ?si=vYtnpdT9Pj8OySMX

In this video, I explore the Heathkit M-1 "Handitester" VOM (multimeter), which was Heathkit's first multimeter from 1949. I cover the following aspects, according to the timeline numbers:

00:00 History
04:48 Overview
11:14 Internal views
16:24 Test leads
16:46 Demonstration
26:35 Closing the case
26:48 Beauty shot
27:11 Overview of the Heathkit M-1 manual
31:43 Schematic diagram (Heathkit version)
39:10 Schematic diagram (my clearer, redrawn version)
46:16 Circuit theory