HYDROS pH 7.0 Calibration Fluid

HYDROS pH 7.0 Calibration Fluid is a single-use, high-precision pH 7.01 neutral reference solution used by virtually every aquarium pH probe and controller. Because pH probes calibrate against two reference points, 7.01 is the neutral anchor included in nearly every calibration — paired with pH 10.0 for reef and saltwater tanks (normally 7.8–8.5) or with pH 4.0 for lower-pH water like calcium reactors and freshwater aquariums.

Key details

• pH value: 7.01 (neutral calibration reference)
• Best paired with: pH 10.0 for reef/saltwater, or pH 4.0 for low-pH applications
• Format: high-precision single-use packet
• Shelf life: store in a cool, dry place for up to 1 year

Frequently asked questions

Do all pH probes use 7.0 solution? Nearly all two-point calibrations include the neutral 7.01 reference, making it the one solution almost everyone needs.

Which second solution do I pair it with? Use pH 10.0 for reef and saltwater tanks, or pH 4.0 for calcium reactors and freshwater.

Which controllers use it? Any HYDROS controller with a Probe Port, such as the Control X3, X4, or Launch.

Shipped fast with expert support. Get your HYDROS gear from real reefers at Marine Concept Supply, with setup help when you need it and local pickup at our Wheeling, IL showroom.

At Marine Concept Supply, all sales are final. Due to the sensitive nature of live animals and aquatic products, we do not accept returns or exchanges under any circumstances. Please review your order carefully before completing your purchase. No Cancellations.

If you have any questions or concerns about your order, please contact us at shop@marineconceptsupply.com and we’ll do our best to assist you.

We Ship UPS and will send tracking as soon as the item ships. 

Return shipping for any approved warranties are not covered and will be subtracted from the approved credit total.

Restock Fees apply to some products, due to their size or a manufacturer policy.Each product with a restock charge is marked online, in the description.

Please inspect your order upon reception and contact us immediately if the item is defective, damaged or if you receive the wrong item, so that we can evaluate the issue and make it right