How often do i need to recalibrate my milwakee ph meter?

[rr14]

I'm new to this stuff. How often do I need to recalibrate this thing? How about tds meters?

 

[MostHigh]

I've the pH51. It's a tank. I went from calibrating each time I fed, to every other, to every third...etc...now days, I don't bother till I notice something outside the norm of what I expect to observe when coupling the same nutes over and over to the same source of water over and over.

 

[Maj.PotHead]

when i used my hanna ph meter i calibrated it monthly so it was spot on, now i dont even bother usen it because i know what the ferts i use do. and how to adjust the PH acordingly to the dossage used

 

[tripnoncid]

I have cheapo meters from ebay...never calibrated...never have had any problems.
trip

 

[Maj.PotHead]

I have cheapo meters from ebay...never calibrated...never have had any problems.
trip

hummm guess your using clean water then my meter would be 0.2 off after a month of use so a reading of 6.5 is really 6.3. and i would rinse the meter before each and every reading. my water comes from the tap 7.2-3ish and ppm's of 500-600

 

[hydrorascal]

Keep your tip wet in 4.01 calibration solution... as Ive been told by 3 Hanna techs.

Good to check ANY meter at least once a month... plants live or die by PH in hydro.

The Hanna Checker 1 on ebay costs bout $35 delivered and I know folks who have used the same meter for 3+ yrs.