Since the invention of Bluetooth, it has been widely used.

Bluetooth can achieve wireless meter reading technology of meter (DIN Rail Energy Meter).

Bluetooth features:

Bluetooth chip is only 9mm * 9mm, the current price of about 50 yuan, can be directly embedded in the digital meter.

Its work uses 2400 ~ 2483.5MHz ISM (industrial, scientific and medical) band,

This is because there is no fixed signal interference in the frequency band, and the frequency band is open to the public.

But at the same time, the ISM band is used as an open frequency band, and any frequency band can be used to meet the unpredictable random interference sources (such as some household appliances, cordless telephones, car door openers, etc.).

Therefore, the interference source of external and other Bluetooth users is dealt with by different techniques.

The application of Bluetooth is widely developed, and will be further extended to other digital metering equipment.

http://www.logosmeter.com/index.php/Energy%20Meter%20-%20DIN%20Rail%20Energy%20Meter-LEM016%20Series%20DIN%20Rail%20Single%20Phase%20Electronic%20Energy%20Meter