Used for testing the specific gravity of glazes and clay slip, this hydrometer manufactured by Amaco is approximately 28cm in length and features a readable scale encased in a glass surround.
To use, wet the hydrometer and gently lower it vertically into liquid. The hydrometer will float similar to a buoy so you can take your reading from the scale.
Ideal readings for Glazes:
Dipping or pouring glazes: 0.9 to 1.00
Spraying glazes: 1.5 to 1.7
Brushing glazes: 2.2 to 2.5