I bought the power meter from him and finally I can get to know my power consumption, energy efficient or not by monitoring the power factor and get to know how much the devices consume when on standby.

The accuracy seemed to work as promising, but so far I can only verify the only voltage reading using my own multimeter, but the wattage reading also quite promising.

The Kwh feature is a must need to let some other understand that I did not bump up RM50+ of their electricity bill when borrowing thier wall plug for 30mins of using the compressor pump rated at 1800W!