Tds Meter

[BigC]

I have a tds meter at the back of the drawer (old fish-house equipment) anyone know what type of calibration fluid I need to calibrate the meter for use in testing tapwater and RO water. and also where to purchase. There are so many types of calibration fluids for this instrument and I've forgotton which I used initally.
Incidentally the TDS meter is a Hanna Instruments HI98311 Waterproof EC/TDS and Temperature meter.
The first logical thing to do would be to contact Hanna instruments but I was wondering if there is a universal solution I could use which may work out cheaper.
Here is the link to the meter,
http/www.hannainst.co.uk/acatalog/copy_o...TDS_meter_.html
and before anyone states the obvious, yes I know there are solutions below, question is which one and is there an alternative universal solution I could use.
Any help would be greatly appreciated.
Regards
BigC

 

[SkiFletch]

TBH BigC, TDS meters are probably the simplest piece of equipment we use and should not require calibration. They're just conductivity or resistivity meters which are internally calibrated based on the electronics used. They don't drift as they're all solid-state electronics so they can really only break/fail. If you want to verify it, stick it in tapwater and it should be reading in the hundreds, and then put it in some RO water and it should be near 0.

 

[BigC]

Then why the need for the calibration solutions mentioned in the literature.

 

[Musho3210]

well why do people sell bad skimmers and crappy equipment, products like that just make us paranoid and we buy it and they make money.

 

[SkiFletch]

Then why the need for the calibration solutions mentioned in the literature.

For when dealing with really detailed science which is not what we aquarists require. Remember, your TDS meter tells you when your RO membrane needs flushing/replacing. If it works, your output TDS should be less than 10ppm and when it needs flushing/replacing it'll quickly skyrocket up to 30+, letting you know it's time for flushing/replacing. Whether its 35ppm or 30ppm doesn't matter, you still know you need to change the membrane