The pH meter was developed to directly determine the pH in aqueous media or water-based solutions. The waterproof pH tester PCE-PH20 is used for fast and accurate measurement of pH. The practical display makes the pH value on the pH meter easy to read. Due to the waterproof and robust housing (IP 67), the pH value tester can also be used under difficult conditions. A recalibration always guarantees optimum accuracy and is very easy to perform using the optionally available calibration kits (automatic calibration function without calibration screws—performed only via the keyboard).

Water quality in aquariums is extremely important for the living organisms that inhabit it. Slight changes in pH level and temperature may lead to aggravating results and even death of the fish or reptiles in the water tank. Therefore, the application of the appropriate pH meter is required. The aquarium ecosystem must be as similar to natural conditions as possible. Therefore, measurements should be regular and provide accurate results.

Depending on the purpose of creating an aquarium—commercial, scientific (experimental and laboratory tests), decorative—the most desirable pH level should be maintained to provide correct living conditions for the fish and other possible organisms there. Modern devices are often portable and easy-to-use instruments which help to monitor changes in the pH level during the day or from day to day, etc. The glass electrodes have a long service life and due to a high level of precision and wide measurement range, it is possible to use the meter often and detect the slightest deviations. For this type of measurement, the presence of a temperature sensor is very important, since temperature changes may occur within one aquarium and should be detected immediately.

Regardless of its purpose, the aquarium's main task is to create the best conditions and the most favorable environment. This task can be more challenging than it seems, because simply filling the tank with fresh water is not enough; much depends on the water's parameters and how they may change over time. Depending on the fish type, there may be slightly different requirements for the pH level of water (from 6 to 8 on average, but there may be exceptions). A very influential factor is also the type of water the owner decides to choose for the aquarium. Fresh and saltwater have different desirable pH levels and it is important to take this into consideration. As a rule, saltwater has a higher pH value than freshwater (8 and above). Before choosing the inhabitants for the aquarium, it is necessary to learn more about their natural habitat, because the conditions in the aquarium should be maximally adjusted to the natural ones. The pH level in the aquarium should be maintained at the desirable level. The rise of pH may have a destructive influence, since the increasing ammonia deteriorates the water quality and may be very harmful to the fish. That is why pH level control in the aquarium is practically a daily task if your intention is to have a beautiful water tank with healthy inhabitants.

Fishes are very sensitive to fluctuations in pH, especially if the values differ significantly from their natural and usual levels. The pH tester allows the user to check the current pH level within just a few seconds and make immediate adjustments if deviations occur.