Draper Disc Type Anti-Freeze Tester | Ethylene Glycol Anti-Coolant Testing Tool | Six Floating Discs | Hot and Cold Compatible | 35807

The instructions could be better. They state to "fill to the line" but there IS no line! Couldn't find any info, even online, about whether it mattered how much fluid to draw up so just used enough to get discs floating. Handy to have if you don't want to go to garage for a test.