JZK 36V bidirectional I2C INA226 monitor module for voltage and current power, INA226 IIC I2C Interface Bi-Directional Current/Power Monitoring Sensor

These work fine, hook up power and the two SDA and SCL lines and you've got an accurate current measurement. It has a 0.1ohm shunt on the board which you can use, or if you remove that you can hook it directly up to an external shunt. In my case i've connected it to a 400A/75mV external shunt and it's working a treat, talking to an atmega328p. Seems happy both high or low side.There's two pads on the back of the board for A0/A1 address selection by jumpering them to the nearby VCC pad, so you can have up to 4 of these on the same I2C bus.