HI70024P Hanna — 35 ppt Salinity Calibration Solution 25 Sachets 20 ml - Hanna

Hanna HI70024P salinity calibration solution — 35 ppt, 25 sachets of 20 ml

The Hanna HI70024P is a salinity reference standard at 35.00 ppt built for calibrating reef aquarium salinity testers and refractometers. Each box contains 25 sealed 20 ml sachets — one fresh sachet per calibration, which eliminates the evaporation issue that plagues open bottles. This is the Hanna-recommended standard for the HI98319 Marine Salinity Tester and works with any single-point instrument at 35 ppt.

Why regular calibration is essential

• Reef salinity matters at 1-2 ppt precision (33-35 ppt target) — a drifted instrument gives false readings.
• Probe TDS drifts with time and use — a monthly check keeps readings reliable.
• Sealed single-use sachets — no evaporation that concentrates the solution.
• Compatible with digital Hanna testers, optical and digital refractometers, conductivity probes.

How to use

• Open one sachet, pour into a clean cup.
• Dip the tester probe (or one drop on the refractometer prism).
• Adjust to 35.00 ppt (or 1.026 SG) following the instrument's procedure.
• Rinse with RO water and dry before returning the probe to the aquarium.

Specifications

• Reference: HI70024P (formerly HI7024P)
• Content: 25 sealed 20 ml sachets
• Concentration: 35.00 ppt (traceable)
• Use: single-point calibration for testers and refractometers
• Compatible with: Hanna HI98319, optical and digital refractometers, conductivity probes
• Storage: room temperature, out of direct sunlight.

Why get this solution from ReefSolution

For full reef salinity control we also recommend:

• Hanna HI98319 waterproof salinity tester — the reference digital tester, calibrated with HI70024P.
• Hanna Checker HC HI772 dKH alkalinity — the reef parameter that shifts fastest after salinity.
• Hanna Checker HC HI758 marine calcium — for the Ca/KH/Mg trinity.
• Hanna HI731321 replacement glass cuvettes — to replace scratched cuvettes on Checker HC instruments.

Frequently asked questions

How many calibrations does one HI70024P box provide?

25 calibrations — one sealed sachet per calibration; at one per month that covers more than two years of regular use.

Is HI70024P solution compatible with an optical refractometer?

Yes — 35.00 ppt is the standard reference for marine refractometers; put one drop on the prism and adjust.

Can I reuse HI70024P sachets?

No — each sachet is single-use. Once opened, the solution evaporates and concentrates, which throws off later calibrations.