John Wiegerink
Subscriber
I didn't know exactly where to post this question, so will try here. I just bought a used Pentax Digi spot meter that came with no manual. I pretty much have it all figured out, but for one little thing. It's the little red/orange line just to the right of 60 on the shutter speed ring. I've searched, found the pdf manual, but didn't seem to see this line mentioned. Just curious as to what it's there for. Also, is it worth putting one of those Zone scales on the meter? I think I can close down and open up just as fast in my head.

Meter the shadows, rotate the dial to Zone III, then read off my desired aperture/shutter speed choice. I just know that if I read a shadow area giving me a Zone V exposure value that I'd forget to adjust exposure by -2 stops. That said, I'm sure other photographers are smarter than me! 
-- nah, I just like working with the EV readings, and after taking a few readings I can pretty much figure out my exposure EV and placement/fall of important areas before setting the exposure EV on the dial to select the corresponding f/stop and exposure combo I want to use. So having a visual aid of the Zones on the dial just cluttered it up for me. But I can see why others would like the sticker.