The best thing to do is to act yourself. Usually a girlfriend will come along when you least expect it and you are not looking.
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There is no single method which is most effective in all situations.
Yes
Nearly 100%!
a small cm ruler An effective method to measure a fingernail would be to use a sliding caliper
When you want a large number, one very effective method can be to get a small number and double it. If it's still not as large as you want, you can double it again.