Australia's Science Forum

We also make a home-made indicator out of hibiscus flowers. When they're out of season, or if you don't live in the tropics, then herbal teas containing hibiscus, such as a rose-hip and hibiscus tea, works really well and is very easy to prepare.

Smiley

Renee, Chuck them out and buy digital multimeters from Dick Smith or just about anywhere. They simply show a negative reading if connected incorrectly, frequently cost less, and can be used as either ammeters or voltmeters, as required. I bought 2 sets, and spent some time educating my teachers on h...