PH Pen calibration
 

Please help, when you do calibration on your PH pen, would you use both PH 4 solution and PH 7 solution or...... either one will do?

Thank you very much.

For my ph pen. i only use ph 7. Thats what the shop owner told me..

Unless you need very precise calibration to ensure that the pH pen is accurate for a very wide range of pH, just get the pH 7.0 solution.

There are other solutions available but you don't need to worry about those.

-Calvin

Thanks bro, I had read a lot of articles here posted by you, learnt a lot planted tank stuffs, you are great.
:D:D:D:D

You too bro, both of you like a guru here to guide new bee like me, thanks a lots.

It depens on which model of your pH pen, some are 2 points calibration, some r 1 point. In all cases, 7.0ph as a single solution can be used for 2 points and 1 point model for 1 point calibration.

What is the cheepest pH pen out there i can get? Feel like getting one.

In my experience, try to get those cost in range from $30-$70 is fine, quality & reliability issue, concern.

For used PH pen, u may want to consider my offer here :D clik the link to see

http://www.arofanatics.com/forums/sh...37#post4922537

PH Pen Calibration
 

Hi, bro sorry about making use of ur thread here but since all of u are talking about calibration, I have a question here, that is, when I do calibration of the PH pen to 7 and use it to test my water. After that, when u take out from the water after testing, will the reading go back to 7 again or must I everytime had to do calibration when I want to test water again?

Please advise. Thank

Will only do calibration every 1 month. For my hanna ph pen, my reading is off 0.1 every month. so i just tune it back..