Sybon Opticon Series Salinity Refractometer – FG100sa


  • High-precision, dual-scale instrument for marine/reef hobbyists
  • Measures salinity (0-100ppt) & specific gravity (1.000-1.070 S.G.)
  • With Automatic Temperature Compensation (ATC): 10-30°C
  • Aluminum alloy construction and premium optical refractive lens
  • Includes case, ultra-pure water, dropper, calibration key, and more!

In stock


Opticon Series Salinity Refractometer – FG100sa

Monitoring the salt concentration in your marine or reef aquarium is crucial to maintaining a healthy and successful system. While your average swing-arm hydrometer can be used to measure this important parameter, more discerning aquarists demand greater accuracy from their water testing equipment.

Part of Sybon’s Opticon Series, the FG100sa Salinity Refractometer is a high-precision, dual-gauge instrument that accurately measures salinity (0 – 100 ppt) and specific gravity (1.000 – 1.070 S.G.) in water. It boasts superior craftsmanship, featuring aluminum alloy construction and a high quality optical refractive lens.

The Sybon FG100sa Salinity Refractometer is equipped with an Automatic Temperature Compensation system (ATC). With a compensation range of 10 – 30° Celsius, this setup ensures that the accuracy of your readings is unaffected by moderate temperature fluctuations you may encounter in the field.

Whether you’re new to the world of saltwater or have years of experience, the FG100sa is straightforward and easy to use. It requires only a couple of drops of test solution to provide accurate readings, and comes with a bottle of ultra-pure water for occasional recalibrations. The kit also includes a foam-lined protective case, dropper, calibration key, soft flannel swatch, and user manual.


Model: Opticon Series FG100sa (ATC)
Scale Range: 0 – 100 ppt / 1.000 – 1.070 S.G.
Minimum Scale: 1 ppt / 0.001 S.G.
Accuracy: ±1 ppt
Temperature Range: Automatic
Temperature Compensation: ATC – 10 – 30° Celsius 1.18″ dia. x 7.87″ L

Additional information

Weight1.2 kg
Dimensions10 × 30 × 15 cm




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