ATI Multi Standard Reference Solution

ATI Multi Standard is a seawater reference solution with certified values for checking the accuracy of your test kits, refractometer and meters. Test it exactly as you would tank water and compare against the known values to find any offset. It's made from ATI Absolute Ocean, so it behaves chemically like real seawater, and every batch is checked by the ATI lab in Germany.

Why use a reference standard?

• Validate test kits: Confirm whether your alkalinity, calcium or magnesium kits read true.
• Calibrate: Set refractometers, hydrometers and conductivity meters to 35 PSU.
• Real seawater chemistry: Based on ATI Absolute Ocean, so the reference behaves like aquarium water.
• Lab certified: Every batch passes quality control at the ATI lab in Germany.

Certified reference values

How to use

• Make sure vials and equipment are clean and dry
• Run your test exactly as usual, using the Multi Standard instead of tank water
• Compare with the values above. Example: if your kit reads 8.5 dKH on the 7.5 dKH standard, it has a +1.0 dKH offset
• Close the bottle right after use; evaporation raises the concentration and invalidates the reference

Specifications

Frequently Asked Questions

Can I calibrate my refractometer with it? Yes. It's a 35 PSU standard for refractometers, hydrometers and conductivity meters.

Does it go bad? Keep it tightly closed; evaporation concentrates it and changes the reference values.