How do automatic-dispensing washing machines know how much detergent you need?

If you don't want to be bothered to weigh out the laundry detergent you need for each load, there are machines that do this ...
MySmartPrice

Washing Machines Under Rs 10,000: Samsung, Voltas Beko and More

Compare washing machine deals under Rs 10,000 from VW, Voltas Beko and Samsung, with 6.5kg and 7.5kg semi-automatic models ...

Need cleaner clothes with less effort? Explore 5 washing machines with smart wash features

Explore washing machines with large capacities, AI-assisted wash programmes, steam features and inverter motors. | Technology ...
Mint

Tired of doing 3 loads a day? 5 High-capacity washing machines every 5-person household needs, Samsung, LG, more

Living in a large family means having a large piles of laundry to wash almost everyday. This can easily turn into a never-ending chore, especially when you have a washing machine of wrong capacity.