It's important to keep your pH pen in tip-top shape, so you can get the most accurate readings possible. Just like a good friend, your pH pen can change over time. That's why we recommend giving it some TLC by calibrating it before its first use and every 6 months afterwards. It will need to be recalibrated if used very frequently, has been out of use for a long period of time, or has not been stored properly. But don't worry, it's a quick and easy process that will ensure your pH readings are as precise as can be.
Note: Make sure the buffer solutions are completely dissolved before calibrating your pen.
Always replace the cap after use and store in a cool, dry and dark place.
Written instructions below:
- Unbox your pH pen.
- Gather three clean cups and spoons. Fill each cup with 1 cup of room temperature water.
- Pour each buffer solution into a separate cup and stir gently with a separate spoon until dissolved. Place each packet next to the corresponding cup.
- Remove the pen cap and protective film from the screen.
- Clean the electrode by holding it under clean running water.
- Press the âON/OFFâ button to turn on the pen.
- Immerse the electrode in the cup with the 6.86 buffer solution. Do not exceed the immersion line. Press âCALâ for 5 seconds. 6.86 will flash 3 times.
- Clean the electrode by holding it under clean running water.
- Immerse the electrode in the cup with the 4.01 buffer solution and press âCALâ for 5 seconds. 4.01 will flash 3 times.
- Clean the electrode by holding it under clean running water.
- Immerse the electrode in the cup with the 9.18 buffer solution and press âCALâ for 5 seconds. 9.18 will flash 3 times.
- Hold the electrode under clean running water, gently dry it and replace the cap.