Salinity Calibration Sachet - 35 PPT - Hanna Instruments

The Hanna HI70024P provides a reliable 35.00 ppt salinity reference point for calibrating refractometers and conductivity-based salinity meters used in reef and marine aquarium keeping. The solution is standardized with a conductivity meter calibrated against potassium chloride NIST 2202 Standard Reference Material, prepared in deionized water using Class A glassware, certified weight-checked balances, and certified thermometers — the same rigor applied to laboratory-grade analytical solutions.

Each sachet contains 20 mL of solution, enough for a single calibration session. Single-use format eliminates the contamination and concentration drift that can occur when repeatedly dipping into a shared bottle, which is a common but often overlooked source of calibration error. The foil packaging blocks UV light that would otherwise oxidize the solution and shift its actual value over time.

A temperature chart printed on every sachet shows the actual ppt value across a range of temperatures, so calibration can be corrected for ambient conditions rather than always requiring a controlled 25°C environment. Lot number and expiration date are also printed on each individual sachet, making traceability straightforward even when a box has been partially used over months.

With a 5-year shelf life for unopened sachets, the HI70024P suits hobbyists who calibrate infrequently as well as those who want a long-term supply on hand without worrying about solution degradation. The portable individual packaging also makes these practical for traveling with equipment or maintaining a second system at a different location.