Measuring instrument - "Wattman" (power meter for standby power).
Wattman is a real plug & play power meter, which measures consumption of used power and standby power by directly plugging in devices to the power meter.
It can measure alternative voltage, current, power, power factor, frequency, electric charge relative to power volume and CO2, and etc.
Wattman is a helpful device to be used by schools, public institutions, industries, and homes for educational purposes and more.