Faulty TDS pens?

[perplex]

so last couple of weeks ive noticed my TDS pens reading have been all over the place, normally i put it in the water and right away it knows. but recently i put it in, it may read 80 for a while, go up to 120. so i take out the water put it back in and it might say 160....

so ive ordered a new one but, im wondering has anyone else experienced this with TDS pens?

[jayc]

Yes, when the battery is low.

Try changing battery. 

Edited March 28, 2016 by jayc

[perplex]

oh ok, guess i never thought of that, i was waiting for the display to fade

[perplex]

Just swapped batterys over, same issue, started off ok at 160 TDS then went up to 180, so took it out, back in started at 170, then went to 160, jumped to 140, 120, 108....

[jayc]

That is certainly not right.

Have you tried cleaning the electrodes with an old toothbrush?

[perplex]

hmm i thought of that, but i dont use it much, and donno if a toothbrush can fit. ill have another look. but i should be getting my new one anyday now,

but im lucky i noticed it, sometimes it would ready 90 TDS, so im kinda lucky i didnt add loads more minerals in it, im going to be running to pens now

 

what pen do you use?

[jayc]

3 hours ago, perplex said:

what pen do you use?

I use HM Digital AP-01 TDS meter.

It has proven to be very accurate so far.

[zn30]

On 29 March 2016 at 11:33 AM, jayc said:

That is certainly not right.

Have you tried cleaning the electrodes with an old toothbrush?

I clean my ph metre electrodes with a firm artist brush, not sure of the number for the brush, just a firm. The bristles are softer than a old toothbrush however firm enough to clean all areas with no scratching.