Do Hydrometers Go Bad?

A well-made hydrometer cannot go bad under normal circumstances, but its readings will be inaccurate if it has sustained a crack or is otherwise damaged. The weight at the end of the hydrometer can also become unattached, which damages the hydrometer's ability to properly float in water and correctly do its job.

Do hydrometers expire?

The NIST certificate that came with your hydrometer is a Statement of Certificate. ... The NIST Traceability Certificate does not expire and is good for the life of the thermometer.

How do I know if my hydrometer is accurate?

So, to check if your hydrometer accurately measures the specific gravity of water, simply float it in pure water (distilled or reverse osmosis water) at the correct temperature. Spin the hydrometer to dislodge any bubbles that may be clinging to it and bring the test jar up to eye level.