EISCOLaboratory Hydrometer - Specific Gravity, Heavy Liquids, Range 1.000 to 2.000 x 0.010 - Includes Protective Case - Eisco Labs

Big font and easy to use. Doesn’t feel fragile, I think I’ll have it forever. Its great. Perfect for glaze accuracy. Great price.

This works flawlessly for my needs. It is accurate and easy to read while being much cheaper that other options. Unfortunately it took about a month to be delivered.

I use this hydrometer to measure the specific gravity of my clay, and my studio helps me to get to a more accurate pouring consistency.

I would have given it 5 star except it comes with literally no instructions. I guess they assume if you are ordering one you already know how to use it.

I tested its accuracy by comparing its reading to a clay glaze known to have a specific gravity of 1.400 as determined by weighing a known volume. The hygrometer was right on. Note that when measuring the specific gravity of viscous liquids, you must wait a long time for the hygrometer to settle. Potters who think their hygrometer is inaccurate probably have not waited long enough for it to settle. Settling in viscous liquids is speed up by vigorously tapping the container, but it will still take several minutes.

It arrived broken. I had to send it back. I should be getting a new one shortly.

I use the hydrometer to measure the specific gravity of pottery glaze. This hydrometer works fine, but it's just kind of long. So, practically, it only works if you're going to measure a large amount of glaze, or measure it in a tall, thin vessel, like a graduated cylinder. I know this hydrometer is accurate because I bought a second one that was half the length. They both came up with the same results.

I’m a potter and the large numbering and scale allow me to make specific gravity readings of my glazes very easy.Jas