Aqua Medic Refractometer

Aqua Medic refractometer is a precision optical instrument for aquariums, mainly used to measure salinity (salt level) in marine systems.

Key specs

• Measurement type: Salinity (‰ / PSU) and specific gravity (density)
• Measurement method: Optical (light refraction)
• Temperature compensation: Yes (automatic)
• Display: Internal scale (often with LED illumination)
• Sample required: Only a few drops of water
• Included:
• Pipette
• Calibration screwdriver
• Calibration/distilled water
• Protective storage box

What it does

• Measures salt concentration accurately in seconds
• Helps maintain stable salinity (critical for reef tanks)
• More precise than hydrometers
• Easy to use with just 2–3 drops of water

Important notes

• Must be calibrated regularly for accurate readings
• Best used with calibration solution (35 PSU)
• Keep prism clean to avoid incorrect readings
• Essential tool for marine (saltwater) aquariums, not needed for freshwater

Who it’s for

• Reef tank owners (very important tool)
• Marine aquarium hobbyists
• Anyone needing precise salinity control