Quote Originally Posted by tomcromp
does any one have any experience caliberating this ph meter ive lost the instructions and cant find them anywhere!
It's simple just put your PH meter in the calibration 7.0 stir it and leave it for a minute or two if your meter shows 7.0 its ok the same with the 4 if it shows4.0 thats fine.
there should be two small screws somewhere on the meter with 7 and 4 next to them, they are used to ajust your calibration if it needs ajustment.
Meter in fluid 7 ajust to 7.
Meter in fluid 4 ajust to 4.
Meters are very sensitive so be carefull when ajusting the screw, be gentle.
I check my meter for accuracy once a month.
You can buy probe cleaning fluid to clean the probe on your meter.
One more thing don't cross contaminate any of the fluids.
Hope this helps.
Greenthing Reviewed by Greenthing on . Yellow / brown spots on leafs newbie help Hello i have yellow/ brown spots on my leaf, i cut the lower leafs off as they where bad and drying out. I have been given it tap water which is ph6.2-8 and today for first time since planting i gave them some nutrients and ph was ph5.4-5.6 humidity 66% 25 degrees Celsius. they are under a 125watt cfl The lights have been on 24 hours I have now turned the light to 18-6 They are 2 G-13's, 1 Blue Cheese and 1 Violator Kush You can look at the pics below Please let me know what you think Rating: 5