HYDROS 35ppt Salinity Calibration Reference Solution, 100 mL
SKU: HDRS-SCS35
- Essential Two-Point Probe Standard: Serves as the mandatory high-range (35 ppt) reference point required alongside 28 ppt solution to establish an accurate linear calibration slope on HYDROS K-10 Salinity Probes.
- True Natural Seawater Benchmark: Formulated with ultra-pure deionized water and analytical-grade salts to match standard reef salinity at 35.0 ppt (~1.0264 Specific Gravity, 53.0 mS/cm conductivity, and 1.3394 Refractive Index at 25°C).
- Universal Instrument Compatibility: Accurately calibrates HYDROS Control X3-S, Control X10, Control Pro, HYDROS iV isolation vessels, optical refractometers, digital seawater meters, and swing-arm hydrometers.
- Compact 100 mL Dispensing Bottle: Convenient 100 mL (3.38 fl oz) size provides ample fluid for dozens of probe and refractometer calibrations while minimizing long-term shelf exposure.
- Evaporation-Resistant Sealing Cap: Packaged in a seawater-stable HDPE squeeze bottle with a tight-sealing flip cap to prevent moisture loss and concentration drift between testing sessions.
- Eliminates Zero-Point Slope Errors: Avoids the refractive index and conductivity curve inaccuracies caused by calibrating seawater instruments with plain RO/DI freshwater.
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HYDROS 35ppt Salinity Calibration Reference Solution (100 mL)
Maintaining stable natural seawater salinity at 35 parts per thousand (~1.0264 Specific Gravity) is critical for stony coral calcification, invertebrate osmoregulation, and reliable automatic top-off safety. However, conductivity probes, digital meters, and optical refractometers inevitably experience gradual sensor drift, electrode bio-fouling, and mechanical shifts over time. Calibrating marine instruments with pure RO/DI freshwater introduces substantial slope errors when measuring high-ionic seawater. The HYDROS 35ppt Salinity Calibration Reference Solution, 100 mL (SKU: HDRS-SCS35) is the official OEM reference fluid engineered specifically for HYDROS Salinity/Conductivity Probes, Digital Salinity Monitors, and Optical Refractometers.
To achieve laboratory-grade measurement accuracy across reef operating ranges, HYDROS K-10 conductivity probes rely on a two-point calibration protocol anchored at 28 ppt and 35 ppt. By referencing both ends of the marine spectrum, your HYDROS controller calculates an exact conductivity slope right at the target reef threshold. Blended from ultra-pure reagent water and precision-weighed salts, HDRS-SCS35 delivers an exact 35.0 ppt reference standard (53.0 mS/cm conductivity and 1.3394 Refractive Index at 25°C). Packaged in a compact 100 mL squeeze bottle, it allows aquarists to perform fast, repeatable single-point checks on handheld refractometers or complete two-point calibrations on automated HYDROS monitoring systems without waste.
Ideal Application & Upgrade Scenarios
If you run a HYDROS Control X3-S, Control X10, or HYDROS Salinity Kit and need fresh high-range fluid for your scheduled 8-week probe recalibration, if you verify your reef display weekly with an optical refractometer or digital salinity pen, or if your previous calibration bottle has experienced evaporation over time, HDRS-SCS35 restores verified diagnostic accuracy.
(Note: Package includes (1) 100 mL Bottle of HYDROS 35ppt Salinity Calibration Reference Solution. 28ppt calibration solution, K-10 conductivity probe, HYDROS iV isolation vessel, and refractometers sold separately).
What’s Included:
(1) 100 mL Bottle of HYDROS 35ppt Salinity Calibration Reference Solution (HDRS-SCS35)
Technical Specs:
SKU / Factory Part Identifier: HDRS-SCS35
Bottle Volume: 100 mL (~3.38 fl oz)
Calibrated Salinity Reference: 35.0 Parts Per Thousand (ppt) / 35.0 PSU
Equivalent Specific Gravity: ~1.0264 SG (at 25°C / 77°F)
Equivalent Conductivity: 53.0 mS/cm (at 25°C / 77°F)
Equivalent Refractive Index: 1.3394 nD (at 20°C–25°C)
Chemical Composition: Analytical-Grade Seawater Reference Salts in Ultra-Pure Deionized Water
Container Design: High-Density Polyethylene (HDPE) Squeeze Bottle with Tight-Sealing Flip Cap
Shelf Life: Up to 24 Months when tightly capped and stored out of direct sunlight
Compatible Equipment:
Lab-Grade K-10 Salinity/Conductivity Probe
HYDROS Control X10, Control Pro, and Control X3-S
HYDROS iV Automated Testing & Isolation Vessel
Optical Salinity Refractometers, Digital Seawater Refractometers, and Conductivity Monitors
While most of our equipment carries a one-year manufacturer's warranty, consumable products like fish and coral foods are not covered under traditional warranty terms due to their perishable nature and varied storage conditions. However, we fully stand behind the quality of every product we sell. If you experience any issues with your food purchase shortly after receiving it, such as concerns about freshness, packaging integrity, or product quality, please contact us at [email protected]. We're committed to making it right and will work with you to resolve any problems quickly and fairly.
Calibration & Handling Guidelines:
Temperature Acclimate the Fluid: Prior to calibrating, allow the sealed 100 mL bottle of HDRS-SCS35 to sit near your sump or float in a watertight bag in aquarium water for 15–20 minutes so the fluid matches ambient probe temperature.
Prepare the Sensor: Rinse your HYDROS K-10 conductivity probe tip in clean RO/DI water and gently blot away excess moisture with a lint-free tissue.
Dispense a Working Sample: Pour a small amount of HDRS-SCS35 into a clean, dry diagnostic cup or sample vial. Never insert a probe directly into the master 100 mL bottle to prevent cross-contamination.
Complete Low-Point Calibration First: If performing a two-point calibration on a HYDROS K-10 probe, complete the 28 ppt calibration step first using HYDROS 28ppt calibration solution, then rinse and dry the probe.
Dislodge Micro-Bubbles: Submerge the probe tip fully into the 35 ppt sample cup and swirl briskly for 5–10 seconds to release air bubbles trapped inside the electrode shroud.
Stabilize & Confirm: Allow 1 to 2 minutes for the probe's temperature sensor to equalize. Open the HYDROS app, navigate to your Salinity Input calibration menu, select the 35 ppt high-point step, and confirm once the raw reading stabilizes.
For Optical Refractometers: Apply 2 to 3 drops of HDRS-SCS35 onto a clean, dry daylight prism, close the cover plate, wait 30 seconds for thermal equalization, and adjust the calibration screw until the shadow boundary aligns with 35 ppt (or 1.0264 SG).
Discard the used sample fluid from the cup and snap the master bottle cap tightly shut immediately.
Pro Tips:
- Never Dip Probes Directly Into the 100 mL Bottle. Even a single droplet of residual RO/DI rinse water or aquarium saltwater clinging to a probe body will dilute or concentrate the remaining fluid inside the compact 100 mL bottle, skewing all subsequent calibrations. Always pour a small working portion into a clean glass vial or plastic sample cup, run your calibration, and discard the used liquid down the drain.
- Eliminate Trapped Air Bubbles Around K-10 Electrodes. Tiny air bubbles clinging to the internal electrodes of a conductivity probe act as electrical insulators, artificially reducing conductivity measurements and causing falsely low salinity readings. While submerging the probe in your 35 ppt sample cup, gently tap the probe against the side of the cup and swirl it in circles to expel trapped air before locking in your calibration value.