Bluecol anti-freeze Tester
It’s a shame the back of the pack focuses more on promoting Bluecol than on how to use the device safely. Other than that, this is a dead ringer for the Sealey and Silverline.
It also suffered from the same variation in measurements, registering less protection than it ought to at the lower levels. It was some way off at the 50 per cent level with the silicate anti-freeze, too.