In chemistry, the acidity or alkalinity of a solution is measured in pH. Pure water has a neutral pH level of 7, so the closer the pH level of water to 7 is, the purer it is. However, the pH level of water can change, depending on the chemicals added to it or the elements it is exposed to. The higher than 7 the pH level is, the more acidic the water is. This fact poses a major problem for aquariums. Fluctuating pH levels, especially levels far higher than pH 7, can make fish ill, or may even kill them.

To solve this problem, you need a meter in your tank to give you pH readings. However, the pH bulb that does the reading in this kind of meter is not completely impermeable, so the reference solution inside the bulb changes over time. The reference solution needs to be calibrated regularly if you want the meter to consistently give accurate readings. The pH 7.0 Buffer/Calibration Solution from Pet Store can help you in this aspect. A couple of drops the buffer solution should be enough to recalibrate the reference solution in the bulb.

The pH 7.0 Buffer/Calibration Solution can come in small packets or big bottles, but you`ll save more in the long run if you get the 500 ml bottle instead, because recalibration is something you`ll do on a regular basis if you own an aquarium.

Calibration solution for pH monitors or controllers. pH 7.0. 500mL.



**Variations of this product can be found in many online stores. The version we carry is of the highest quality. Although this item is eligible for price matching under our Low Price Guarantee, please be certain the product you want to price match is the same make and model.