Unblock AptoideAptoide is a safe app! Just tap on More details and then on Install anyway.
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Complete the installation and open Aptoide
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Description of Ruler
Use your phone as a ruler. This Ruler app supports three types of scales: metric ruler, inch ruler, fractional ruler in inches. You can use a coin or a credit card to calibrate the scale, even if you don't have a real ruler handy!