recalibrating pH meter

[orbsycli]

I just bought a digital ph meter and it tells me I need to recalibrate it once a month.

I googled the term and found nothing useful.

What does it mean to recalibrate this little device?

[Mercedes Benzene]

You need to give it a sample solution to base it's calculations off of.
So, what you want to google is "buffer solutions". You usually need to give it more than 1 sample (2 or 3 of varying pHs is preferable) so that it can function properly.
Hope that helps.

[jab2]

Originally Posted by orbsycli

I just bought a digital ph meter and it tells me I need to recalibrate it once a month.

I googled the term and found nothing useful.

What does it mean to recalibrate this little device?

Google "pH meter" +calibrate. 1st two results will get you on the way.

The frequency of calibration depend on the type of usage and therefore the accuracy needed. We calibrate once a day for process control, but if you do not need 0.05 pH accuracy, once a month might be OK. Just follow the probe storage instructions in the manual. How you store the probe is very important as it is filled with either a 3Molar or a saturated KCl solution. This is open to the atmosphere through a sinter glass membrane and can change in concentration if some water evaporate.