Also nice for throwing buckets. White, flexible bit strong, lid included. Inexpensive enough to stock up on.
Size is overall length including handle.
The hydrometer is placed in the container where it will float like a buoy and the meter can be read. Dipping or pouring glazes generally have a specific gravity of 0.9 to 1.00. The range for spraying glazes is 1.5 to 1.7, and for brushing glazes is 2.2-2.5.