HYDROS pH 4.01 Calibration Fluid



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HYDROS Single-Use pH Calibration Solution Packets

Most Hydros pH controllers and monitors require two reference points to ensure the accuracy of the pH of the instrument is measuring. It is recommended to utilize calibration solutions that are in the opposite spectrum that corresponds to the pH level you want to measure. In reef tanks, where the pH range is usually 7.8-8.5 the best choice is to make use of the calibration solution 7.0 as well as 10.01. For calcium reactors in freshwater aquariums and saltwater tanks with a pH that is usually lower than 7.0 and above 7.0, you should to make use of 4.01 and 7.01 to calibrate the probe. 4.01 pH - AThe low threshold read that your pH controller or monitor requires for calcium reactors for saltwater aquariums. solutions that are below 7.00 pH, as well as the majority of freshwater aquariums. The calibration packets can be kept in a dry, cool area for up to a year.
0.02 lbs
5 × 0.2 × 0.2 in


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Helpful Questions From Clients
Frequently Asked Questions
Is hiring a professional necessary to set up a saltwater aquarium?

As a general rule, a larger custom aquarium might require installation by a professional. However, a kit from our online fish store is relatively affordable and beginner friendly. That means you should have no problem setting it up yourself.

Which saltwater aquarium fish should you choose when starting out?

Consider a yellow tang fish. This popular saltwater aquarium fish does a great job of coexisting with other types of fish you’ll find in our online fish store.

How does a saltwater aquarium differ from a freshwater one?

Saltwater aquariums require a bit more maintenance and monitoring than freshwater tanks. Different fish require different levels of salinity, pH tolerances, and temperature requirements. They also require specialized pumps, filters, and other equipment that can handle salt. We can guide you through everything you need to know to set up a healthy, thriving reef tank.

Do fish in a saltwater aquarium swim in a school?

That depends on the species. However, if it’s a fish that swims in a school in the wild, they’ll do the same in an aquarium. Some fish that swim in schools include the green and blue chromis, cardinalfish, and dartfish, for example. When ordering from an online fish store, make sure you do your research on how specific fish species behave to ensure they’ll school (or at least coexist) with your current fish.

Is the effort required to maintain a saltwater aquarium worth it?

Yes! Many aquarists dream of owning thriving saltwater aquariums. You have a tiny piece of the ocean in your home, featuring magical and exotic fish that can only survive in saltwater.