How to use Mai Jia Letter Instrument without inserting a card?

Use through the menu.

1. Plug the power plug into the socket, and a menu will appear after plugging it in.

2. Select local use and follow the prompts in this menu.

3. You can choose remote operation.

4. Operate by voice. Mai Jia letter instrument is a real-time instrument specially used for measuring, monitoring and analyzing specific air parameters.

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