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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. Equipped with an Automatic Temperature Compensation system (ATC). Review: Excellent quality - Works perfectly and easily allows me to verify and track my salinity. Takes a few seconds. Review: ⭐️⭐️⭐️ Works, but accuracy and consistency depend on calibration - This refractometer does the job, but it’s not quite “set it and forget it.” With proper calibration, it can give reasonably accurate readings, and the automatic temperature compensation is helpful when conditions change slightly. That said, accuracy really depends on frequent recalibration. I found that if you don’t calibrate often, readings can drift, which defeats the purpose if you need consistent measurements (especially for aquariums or salinity-sensitive setups). The adjustment screw is a bit sensitive, so small turns can cause noticeable changes. Build quality is decent but not premium. It feels fine for occasional use, but I wouldn’t rely on it for professional or lab-level accuracy. The optics are clear enough, though focusing takes a little patience at first. Pros: • ATC feature helps with temperature changes • Easy to use once calibrated • Compact and portable • Good for basic or hobby-level use Cons: • Needs frequent recalibration • Adjustment screw is overly sensitive • Not ideal for precision-critical applications Overall, this is okay for hobbyists who don’t mind double-checking calibration, but if you need high precision or long-term consistency, you may want to invest in a higher-end model.
| ASIN | B00204I4I4 |
| ASIN | B00204I4I4 |
| Best Sellers Rank | #601,417 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #326 in Lab Refractometers |
| Customer Reviews | 4.0 4.0 out of 5 stars (18) |
| Date First Available | August 19, 2004 |
| Date First Available | August 19, 2004 |
| Manufacturer | Sybon |
| Manufacturer | Sybon |
K**.
Excellent quality
Works perfectly and easily allows me to verify and track my salinity. Takes a few seconds.
A**Y
⭐️⭐️⭐️ Works, but accuracy and consistency depend on calibration
This refractometer does the job, but it’s not quite “set it and forget it.” With proper calibration, it can give reasonably accurate readings, and the automatic temperature compensation is helpful when conditions change slightly. That said, accuracy really depends on frequent recalibration. I found that if you don’t calibrate often, readings can drift, which defeats the purpose if you need consistent measurements (especially for aquariums or salinity-sensitive setups). The adjustment screw is a bit sensitive, so small turns can cause noticeable changes. Build quality is decent but not premium. It feels fine for occasional use, but I wouldn’t rely on it for professional or lab-level accuracy. The optics are clear enough, though focusing takes a little patience at first. Pros: • ATC feature helps with temperature changes • Easy to use once calibrated • Compact and portable • Good for basic or hobby-level use Cons: • Needs frequent recalibration • Adjustment screw is overly sensitive • Not ideal for precision-critical applications Overall, this is okay for hobbyists who don’t mind double-checking calibration, but if you need high precision or long-term consistency, you may want to invest in a higher-end model.
D**L
Reliable
This is the best refractometer for the money. Unlike cheaper ones, it will hold calibration a month or more. Worth every penny.
A**R
Excellent Refractometer
Excellent tool for keeping my QT tanks and Reef Tanks at the right Salinity. Very quick easy and as accurate as you can get
D**Y
Five Stars
Works great! I haven't tried another brand as comparison, however I have not come across and issues.
M**O
A+
Throw away your plastic hydrometer. This instrument is well built and accurate. Came with detailed usage instructions and a durable carrying case
T**M
Great quality
Very easy to read and feels more solid than the cheaper refractometer I replaced. So far the calibration is holding perfectly between uses.