If you have been using a hydrometer and have never tried a refractometer then you should really invest in one. They use much less water, and can easily be calibrated for accurate repeatable readings.
Refractometers are one of the best pieces of equipment an aquarist can purchase. It not only ensures accurate measurements of salinity but it is also infinitely easier to use and read.
Range: 1.000 - 1.070 SG
Comes with the following:
- Dropper
- Carrying Case
- Screw Driver for calibrating
- Adjustable eyepiece