"...is that good enough for reloading..." No. 1/16" is 62.5 thousands of an inch. 1/16" too long and you'll have feeding issues. A tape measure isn't accurate enough. Calipres aren't terribly expensive.
"...gague..." That'd be a guage. A case guage is ok, but isn't versatile enough. A calipre can be used to measure case length and a whole bunch of other stuff too. Like BigJimP says, go with a digital. Easier to read than a regular vernier. There are dial calipres too. They're not too bad. Obviously not as quick to read as a digital.
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