I have a Preethy grinder which is old but I use it to make idli /dosa batter.
Initially it requires some gentle turning by the hand to get it started when there is more rice/urud dal. So I actually add little by little to get it to speed .
After the slow intial pick up , it gets into full speed and grinds perfectly smooth batter .
I want to be very clear with this as I don't want you to come expecting a new grinder . Asking $50 .
You can try out the working by yourself.
It also comes with atta kneader and coconut grinder attachments.
Moving out available by Jan end