How to calibrate a Eco brand PH Pen

[trident]

Hi,
My friend gave me a Eco brand PH pen and I want to get it calibrated before using it.
Does anyone knows how to calibrate this Eco brand PH Pen?
Thanks in advance.

[illumnae]

Hi Richard, i don't have an Eco ph pen (i use Hanna), but generally speaking, to calibrate a ph pen, you need to do the following:

1. obtain a ph reference solution (available at most LFS)
2. pour some reference solution into a container and stick the ph pen in
3. adjust the ph pen (usually using a small screwdriver into a hole in the ph pen. hanna comes with the small screwdriver provided) to the ph of the reference solution (so if it's a ph 7 reference, the pen should read 7.0 after adjustment)
4. remove ph pen from reference solution and rinse with water to get rid of the remaining reference solution
5. voila! calibrated ph pen

[trident]

yixiang,
A big Thank You. Think I got it figured out.
Now to get the calibrate solution.
Tested out tap water and reading is 7.4

[dnsfpl]

read from somewhere, never throw away the calibrate solution
instead leave it in the pen cover and cover back after use
this will make the accuracy last longer

don't know how true is it haha

[crsheaven]

read from somewhere, never throw away the calibrate solution
instead leave it in the pen cover and cover back after use
this will make the accuracy last longer

don't know how true is it haha

it true, the test pen need to be cap back with at least normal water.

[trident]

dnsfpl, crsheaven,
Thanks for your input. Yah, I read it somewhere too.
I guess I need a proper place where the pen can be stored upright, if not, then the liquid might leak out.