Swing Hydrometers

[mark]

http://www.wetwebmedia.com/ca/volume_3/cav3i4/hydrometers/Impressions.htm

[JHG]

Hydrometers may be accurate initially, however with the minute accumulations of salt and other items in the water they evenutally become ineffective. If you have $50 - invest it in a refactometer.

[fishguyxd]

yes a refract and you will see a real difference between the hyro and refract
I really like the refractometer.