Ebay Ph Pens Any Good?

[keenonfish]

Reason I ask is that my ph often reads close to the bottom of my API scale (co2 injected with low kh) and I have reservations as to the accuracy at that end, especially as this doesn't tally with my JBL ph test kit (which I suspect might be superior).

So are these Chinese imports any good? For about £20 you can get a pen with two calibration solutions and they appear, on paper at least to be quite accurate with a resolution only required by some sort of scientist! It appears some also have replaceable probes.

Anyone experienced these? I can see they are really convenient but I am not too sure how long they last. I believe the probe can be cleaned by dipping in an acid solution but suspect this can only be done so many times...

Would be interested in opinions..

Olly.

 

[rabbut]

If properly callibrated, they are as accurate as hobby level pH test kits. Will do the job, but probibly not as accurate as they claim

 

[Truck]

why not get some universal indicator?

 

[bagu]

haha i was going to say the same thing truck

My chemistry department gave me a bottle of the stuff! and litmus paper