pH is one of the most important parameters to monitor for water health. pH stands for “potential for Hydrogen”. It is the measure of the acidity or alkalinity of water soluble substances.
Our pH meter is lightweight, easy to use, and accurate. If you need a quick and easy way of sampling pH, this is the tool for you! The pH meter offers accurate pH readings from 0-14, as close as +/- 0.2pH, and temperature readings within one degree! Calibration is done in with powder pouches in three easy steps a 4, 7, and 10.
How to calibrate and use a pH meter
We need to ensure our pH meters are accurate at all times. For this reason, the pH meter needs to be calibrated often, ideally ahead of each sampling excursion. Without the calibrations, the meter readings can drift over time, leading to inaccuracies. If you are testing on a daily basis, the meters should be calibrated daily.
Items you will need to calibrate your pH meter:
- pH packets provided in the your testkits with the pH of 4, 7, 10.
- Jars or bottles that can hold at least 250 mL of liquid.
- 4 litres of distilled water for calibration solutions and rinsing.
- Water Rangers cloth for cleaning/wiping.
To perform the calibration you will need to follow these steps:
- Fill 3 clean, resealable jars or bottles with 250mL of distilled water each
- Label containers for each pH solution: 4, 7, 10.
- Open calibration packets and pour contents of each pH range into separate containers (follow the labels).
- Stir with clean utensil and wait for 30 minutes or until the powders have completely dissolved.
- Take out your pH meter and power it on.
- Press “CAL” on the pH meter to start the calibration process. The meter will flash 4, 7, and 10 in a cycle. This means it is ready to be calibrated.
- Always start with the solution with the pH of 7, and then move onto 4 or 10 in no particular order for better accuracy.
- Dip the meter into the solution, and wait. The meter will recognize the solution’s pH and indicate it on the screen. For the first calibration, 7!
- Once the meter reads a stable value, without pressing a single key, the meter will automatically save the value and return to the measurement screen.
- Rinse and repeat this process for pH 4 and pH 10. Make sure to rinse meter every time you do a calibration.
- Store calibration solution in a cool location. They can last up to 3-4 weeks and can be reused.
Taking a measurement
- Rinse sample cup 3 times before taking the final sample for the measurement. If possible and safe to do so, you can also dip the meter right into the waterbody.
- Dip the meter into the water and wait for the number on the screen to stabilize before recording the number. You can even press the “HLD” or the hold button to freeze the reading so you can take notes without it changing.
- Since pH is affected by water temperature, you should also use this to record water temperature.
- After the measurement, be sure to rinse the probe with distilled water before the next measurement or before putting it away.
Things to keep in mind!
- To prolong the life of the meter, make sure to keep the pH glass bulb wet by using the cap to protect and store the electrode.
- Make sure to always rinse the probe of the meter before using and between measurements.
- NEVER touch the glass bulb as it is very delicate and can alter your readings.
- If you are testing on a monthly basis, you will have to calibrate the meter every time before heading out.