A free app for Android, by mokyuu.
This app allows you to test atomic clocks. It allows you to create a correspondence in the form of a link, and then send it to another person. You can also set up to four different links. It will receive an email requesting a radio clock from another country, but since you can not create it without materials, please attach the clear material you need. It will work with any smartphone or tablet that has an internal radio antenna. You can use this app to test the performance of your device, and to check if it is receiving a reliable signal.
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