'Gravity ball' for mixtures of Ethylene Glycol only, functioning with less than 5cc of coolant. Gives a simple and quick check of antifreeze content and protection.

No balls floating;
less than> 15% Unprotected
1 ball floating;
between 15-20% AF Protected to -7ËšC
2 balls floating;
between 20-30% AF Protectedto -10ËšC
3 balls floating;
between 30-40% AF Protected to -15ËšC
4 balls floating;
between 40-50% AF Protected to -25ËšC
5 balls floating;
higher than< 50% AF Protected to -364 balls floating;
between 40-50% AF Protected to -36ËšC

% AF and protection calculated at 15ËšC