Right now I'm using my Calumet Grey Card as a base for shooting some silver jewelry. It works great for that. As for metering, I'd rather go with palm-of-hand as Zone VI or moderately-aged asphalt as Zone V.
One of the earlier commentors noted that his two Pentax Spotmeters were a stop apart. I've got two and they agree perfectly with each other. For the last 7 years they have held a particular spot on my darkroom wall as 7 2/3 EV. I check every time I pack them up. Please don't dis my meters!
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