PH tester pens, how long do they last?

How long do ones like this one im gonna link last for?
Do you have to buy replacement parts for it?

hydroponic supplies and equipment for hydroponic grow systems : Canadian Wholesale Hydroponics. 1 (877) 226-4769

also, anyone have one that has to be calibrated? how the hell do u do that? I dont have one yet, so do u have to figure out the ph of the water then calibrate it to that?
cuz thats fkin gay if u have to do it that way

lol... you take your ph tester, and dip it into the "calibration liquid" maybe its 7.0..maybe 5.0..doesnt matter.. What does is that you calibrate it right so it reads what the cal liquid does.

Then u dip it n water and it'll read for ya

Mystery101 said:

lol... you take your ph tester, and dip it into the "calibration liquid" maybe its 7.0..maybe 5.0..doesnt matter.. What does is that you calibrate it right so it reads what the cal liquid does.

Then u dip it n water and it'll read for ya

Click to expand...

ahhh ok get it.. this site doesnt even have that liquid .... i dont think

MAKE SURE that the pen comes with something....Because they could sell you a pen...without the cal liquid. and make you waste time waiting for that.

I ph pen is useless unless calibrated.

Good Luck buddy

if you get a pen without cal liquid.. get a few ph strips, make up some liquid, and use that to calibrate.

you should order some calibration liquid anyway. Calibrate your pen frequently. The stuff they send might not be enough. I hear order the 5 and the 7.1 stuff and cali with both. Make sure it reads to a 10th also. Like 5.8 or 4.9, not just 6 or 5. I hope that helps.

yeah that is nice one.

socom3riot said:

also, anyone have one that has to be calibrated? how the hell do u do that? I dont have one yet, so do u have to figure out the ph of the water then calibrate it to that?
cuz thats fkin gay if u have to do it that way

Click to expand...

i got a vitalsine pen one off ebay for 15 bucks that you calibrate. it was easy to do, cheap, and works well. look on ebay before you spend that much man.

If taken care of, and stored properly, you can get 2 years out of the sensor. You did get one with a replaceable probe, yes?

me? i dont know. i think so. it's got what looks like a lightbulb inside the end that you could pop out.