Brightwell Refractometer Calibration Standard – Calibration solution 35 ppt

Calibration solution 35 ppt for marine refractometers

Brightwell Refractometer Calibration Standard is a reference solution designed to accurately calibrate seawater refractometers, hydrometers and density measuring instruments used in marine and reef aquariums.

Accurate salinity is a fundamental parameter for the biological stability of a reef system.

🎯 Why use it?

An uncalibrated refractometer has no real value.

Even a brand new device can exhibit a significant difference.
An error of only 0.002 in specific severity can:

• Stressing corals and giant clams
• Disrupting fish osmorregulation
• Affecting the growth and opening of polyps
• Creating invisible but chronic variations in the system

Stability begins with reliable measurement.

❌ Why not calibrate with reverse osmosis water?

Calibrating to 0 ppt (RO/DI water) is not recommended in reef aquariums .

For what ?

Refractometers intended for seawater are designed to be accurate within the actual operating range, which is around 35 ppt.

Calibrating to 0 ppt can:

• Introduce an error in area 33–36 ppt
• Create an invisible offset
• Giving a false impression of precision

You need to calibrate as close as possible to the actual salinity of your aquarium, i.e. 35 ppt (1.0264 SG).

This is the only way to get a reliable reading.

📏 Certified values

• Specific severity: 1.0264
• Refractive index: 1.3394
• Salinity: 35 ppt
• Conductivity: 53 µS/cm at 25°C

Corresponds to natural tropical seawater used in reef aquariums.

📦 Available formats

• 60 ml
• 250 ml

🧪 Instructions for use – Refractometer

1. Shake well before use
2. Clean the prism with distilled water.
3. Dry completely
4. Place a few drops of solution
5. Wait 45 seconds
6. Adjust to 35 ppt

Recalibrate regularly to ensure accuracy and stability.