You might also note that in my article Test Exposures in Printing I provide a handy chart of exposure times in 1/4-stop intervals from 5 seconds to 160 seconds. All you have to do is print the chart and put it up next to your enlarger. I do note in the article that, if you are making exposures less than 30 seconds, 3 second test strips are almost as accurate and a lot less trouble. But if your exposures are above 30 seconds you may find that precise 1/4-stop test strips are more useful in finding the desired exposure quickly.
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