Measure the total kgs of idli batter after grinding.
For example if you grind 1 kg of rice and 200 grams of dhall in wet grinder, You may get 3 kgs of output(i:e Approximately idli batter)
For 3kgs of idli batter 3* 4 grams of Bama Binder = 12 grams
Take 12 grams of bama binder.
Sprinkle the bama binder gently while grinding the dhall.
Mix the rice and dhall together. Now your idli batter is ready to get pack.
Further, reference Ready reconer.
1kg = 4 grams
20 kg = 80 grams