mate I have no idea-my father used both of these when he was managing the Plaza/Menzies hotels. I am guessing these kits were both used to test alcohol strength.
During the 60s my father held the license for the Plaza-later to become the Menzies Hotels-Wynyard station. He was required to record Alcohol strength tests by the Department weights and measures. He had a Hydrometer kit plus another kit which was certified by the department as being...