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Saltwater Hydrometers and Refractometers
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Aquarium Hydrometers and Refractometers

  • Saltwater specific gravity testing
  • Ideal for Marine and Reef aquariums

Deep Six
Aquarium Supply Coralife Deep Six Hydrometer cl_deep_sixCoralife Deep Six Hydrometer. Takes a true water sample at 6in depth. Avoids inaccurate surface samples. Every Deep Six Hydrometer is laser-marked with an individual certified calibration number. Accurate to 0.001 specific gravity units. Designed to give temperature corrected readings from 68deg - 85 deg F.   more...$7.95
Captive Purity
Aquarium Supply Captive Purity Refractometer cp_refractometerCaptive Purity Refractometer. The Captive Purity Refractometer is an optical device (no batteries) dual scaled 0-100% specific gravity: 1.0 to 1.070. Calibrate with distilled water. Adjustable eyepiece, carrying case, pipette and calibration screw driver included. This model is ATC (automatic temperature compensating). RHS-10ATC.   more...$59.95
Digital Refractometer
Aquarium Supply Captive Purity Refractometer mil_dig_ref_887Milwaukee Digital Refractometer Model MA887. The MA887 refractometer is an optical device that is simple and quick to use and provides highest accuracy possible for the measurement of seawater 3 specific scales, practical salinity units (PSU), parts per thousand (PPT), and specific gravity (S.G.). Samples are measured after a simple user calibration with distilled or deionized water. Stainless steel sample well. Measures in 1.5 seconds. Automatic Temperature Compensation (ATC) between 50 to 104degF. Auto-off. Range:1.000 to 1.114. Resolution: 0.001. accuracy: 0.002 specific gravity. 9 volt battery included.   more...$109.99