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By certification 
* It meets standards of DIN 53505, ISO 868, ISO 7619, ASTMD 2240, JISK7215.
* With average calculate function.
* Peak value deposit function.
* Under-voltage alarm function.
* Use “USB data output” and “RS-232 data output” to connect with PC.
* Provide “Bluetooth ™ data output” choice.
* With average calculate function.
* Peak value deposit function.
* Under-voltage alarm function.
* Use “USB data output” and “RS-232 data output” to connect with PC.
* Provide “Bluetooth ™ data output” choice.
