Brightwell Aquatics Refractometer & Hydrometer Calibration Standard – 60 ml

Ensure your salinity measurements are spot-on by using Brightwell’s precise calibration standard—perfect for refractometers and hydrometers alike. Quick, easy, and essential for reef accuracy! 
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Specs You Can Count On

• Salinity: 35 ppt
• Specific Gravity: 1.0264 (at 25 °C)
• Refractive Index: 1.3394
• Conductivity: 53 µS/cm (at 25 °C)

Use It Properly

• Shake well before using to mix salts completely 🔄
• For Refractometers:
  1. Clean and dry the prism.
  2. Apply a few drops of calibration fluid.
  3. Close the cover and wait 45 seconds ⏱.
  4. Adjust the calibration screw to read 35 ppt.
• For Hydrometers:
  1. Rinse and dry the hydrometer.
  2. Fill gently with calibration fluid—avoid bubbles.
  3. Tap swing arm to remove bubbles.
  4. Hold level; reading should show SG 1.026 at 25 °C.

Why It Matters

• Refractometers can vary by ambient light—regular calibration keeps your readings accurate.
• Recommended monthly checks for consistent salinity precision.
• Essential for successful reefing where small changes matter.

What’s Includes

• 60 ml bottle of calibration standard
• Brightwell-designed dropper cap for easy use

More Information