[sage]

Can some one please translate the 1:3 or 10% or grams per litre acid measurements to something I can easily measure like specific gravity. I have used my acid bath for quite some time and I know I've lost a lot of water through evaporation. Knowing that the original mixture was 3:1 "battery acid" - which I assume is a variable itself - doesn't help me now and I don't have any sofisticated equipment to measure grams/litre. Can someone relate these measurements to specific gravity which anyone can measure with a simple $3.00 car battery hydrometer? If there is a conversion formula I'd appreciate knowing it since I'd like to experiment with diffferent concentrations in my process in the future.

Thanks