Grow Room Ph Meters... Which one.. How much...

[stanko]

I have had lots of fun playing with ph liquid, and then testing it, and then testing, etc.. it makes the process much longer than it needs to be...

so I am trying to figure out which one of these ph machines I should get.

http://www.amazon.co.uk/meter-pocke...PJ6A/ref=sr_1_9?ie=UTF8&qid=1306599419&sr=8-9

http://www.amazon.co.uk/Digital-pH-...8Y/ref=sr_1_19?ie=UTF8&qid=1306600211&sr=8-19

http://www.amazon.co.uk/Meter-Digital-AQUARIUM-Tester-Hydroponics/dp/B0037KIZRK/ref=pd_cp_lp_2

http://www.amazon.co.uk/VOLTCRAFT-V...f=sr_1_3?s=kids&ie=UTF8&qid=1306599755&sr=1-3

I'm not in need of spending 160 bucks for one.
http://www.amazon.co.uk/gp/product/...ils?ie=UTF8&me=&qid=1306600941&sr=8-7&seller=

I like the look of the last one from voltcraft.

 

[C.E]

Get a good brand like Hanna:

http://www.amazon.com/Hanna-Instrum...0VY2/ref=sr_1_5?ie=UTF8&qid=1306617710&sr=8-5

http://www.amazon.com/Hanna-Instrum...P2/ref=sr_1_10?ie=UTF8&qid=1306617710&sr=8-10

I myself have a Hanna HI98108 which is for around 60$, in between those two.

edit: found the HI98108 here for 45$:
http://www.easymeters.com/cart/product.php?productid=1737&cat=0&page=1

its better than the HI98107 since it has automatic temperature compensation (edit).

Make sure you get a bottle of 7.0 (500ml) fluid and atleast one or two 5ml packs of the 4.0.

You will need to always keep like 1ml or 2 of the ph 7.0 buffer solution inside the cap, and replace that solution every 2 weeks or so.

Gluck

 

[stanko]

Cheers guys, on Monday I will see if they ship to my neck of the woods, and i'll get the distilled water for cleaning.

I keep seeing solutions for ph meters. do they need to be calibrated often, and do they arrive perfectly set when new.

 

[mr.mcgregor]

even if the one you get says its pre calibrated its worth checking yourself before you use it as a non calibrated ph meter is as usefull as no ph meter, then check it every week or so, it only take a few mins to do.