Red Sea ReefSense Salinity Calibration Solution (53.1 mS, 5-Pack)

Red Sea ReefSense Salinity Calibration Solution is the reference fluid that keeps your ReefControl salinity readings honest. Conductivity probes pick up biofilm and drift over time, and salinity is one parameter a reef cannot afford to have wrong. Each of the five single-use 20 mL foil sachets is pre-mixed to the seawater standard of 53.1 mS/cm at 25 C, which is 35 PSU or 1.0264 specific gravity, so recalibrating the ReefSense Salinity & Temperature Probe through the ReefBeat app takes a couple of minutes and lands exactly on natural seawater.

Why You'll Love It

• Natural seawater standard. Calibrated to 53.1 mS/cm (35 PSU) at 25 C, the salinity most reefs target.
• Sealed and fresh. 20 mL single-use pouches eliminate evaporation and contamination that throw off opened bottles.
• App-guided. Sized for the step-by-step calibration inside ReefBeat.
• Five sachets. Plenty of calibration cycles for a year of maintenance.

How to Calibrate

Rinse the probe in RO/DI water, let the sachet reach room temperature (readings are temperature compensated at 25 C), open ReefBeat, and follow the salinity calibration prompts. Recalibrate every one to two months or whenever the reading disagrees with a trusted refractometer.

Specifications

Complete Your Setup

• ReefSense Salinity & Temperature Probe (the probe this solution calibrates)
• ReefControl Pro or ReefControl Lite controllers, or the Pro Deluxe Kit
• Single Probe Holder and Magnetic 4-Probe Holder
• Browse all saltwater supplies

FAQ

Why 53.1 mS? It is the conductivity of natural seawater at 35 PSU, so calibrating there puts the probe's best accuracy right at reef salinity.

Can I use a refractometer instead? A refractometer checks your water; this solution corrects the probe so its readings match. Use both.

Single use only? Yes. Once opened, discard the sachet; never pour it back.