How to Measure Total Household Electricity Consumption With a Single Device?

Good morning.
I need to measure the total consumption of all households (TV, washing machine, water heater, LEDs, etc.). How could I measure the total consumption (and not individual consumption)?
Is there any measuring instrument to be connected upstream of the home system?
Thank you all
John

Your house's electric meter already does this. The numeric dials or numeric display show kilowatthours. Read the meter twice 24 hours apart, calculate the difference of the two readings, and divide by 24 hours to get the average kilowatts.

For power readings, time one full rotation of the meter's disk. On the meter's nameplate there is a notation, "Kh 1.0", the number may be different for your meter. The Kh value is the number of watthours for one rotation of the disk. Electronic meters don't have the disk. Instead, they have three spots, usually in the lower right corner of the display, which cycle through a repeating pattern, and Kh is watthours per cycle of the pattern.

Hi Peter.
Fantastic.
Thank you so much.
John.

Thanks Peter.