Milwaukee Instruments MA871-BOX Digital Brix Sugar Refractometer for General Measurements with Protective Padded: Science Lab Meters: Amazon.com: Industrial & Scientific
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Digital Seawater Refractometer MA887 - Milwaukee - SaltwaterAquarium.com
Amazon.com: Milwaukee MA887 Digital Salinity Refractometer with Automatic Temperature Compensation, Yellow LED, 0 to 50 PSU, +/-2 PSU Accuracy, 1 PSU Resolution (color may vary) : Industrial & Scientific
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Can Milwaukee's Digital Refractometer Be the Easiest Way to Check Your Tank's Salinity? We Think So. - YouTube
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Amazon.com: Milwaukee MA887 Digital Salinity Refractometer with Automatic Temperature Compensation, Yellow LED, 0 to 50 PSU, +/-2 PSU Accuracy, 1 PSU Resolution (color may vary) : Industrial & Scientific