Tutorials [Sticky] How I calibrate my Blulab pH pen.

Hi everyone, Its time to calibrate my Blulab pH pen again so I thought I'd do a quick thread about how I do  it👍

It's really important to use a pH pen to monitor the pH of your water, if you have a problem with your girls, the first thing anybody is going to ask you is what's the pH going in and the pH coming out. Incorrect pH can cause all manner of plant issues so it's important to keep your pen calibrated. 

I use GT's pH 7 & 4 buffering solutions. I'll have a clean glass of tap water ready and two 60ml plastic measuring cups.

 First I'll rinse the pen in clean water

 Then pour some pH7 buffer solution into one of the plastic cups, press the Cal button and watch zeros go across the screen. Once you see four zeros then pen will be calibrated for that solution.

Rinse the pen in fresh water and then repeat the above steps for pH 4 buffer solution. 

Finally rinse the pen one last time and your done👍

Remember to keep the probe tip wet all the time, you can't let it dry out or the Pen won't ever work reliably again. 

Hope that may be of interest to someone.

Cheers Leo🤛