1991 MB 300-SEL

Working a battery drain issue. Found a maybe somewhat different way to testing for current drain in a car magazine article. Demonstrated on this youtube video as well:

Fixing Battery Drain In Your Car - YouTube

Using the infamous Craftsman multimeter that reads duty cycle. This meter has auto-ranging. Meter set to DCV. With the meter hooked up, I see the following reading:

037.8

If it read 3.78 I would think 3.78 volts. The 037.8 reading, especially the decimal place has me stumped.

I do realize that I can test for amp draw at each fuse with fuse out and a lead set to each end of the fuse holders with the meter on the appropriate amp scale. What I'm doing here is more of an academic exercise. The voltage reading has me stumped.

Thanks for your time.

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'91 300-SEL