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okiemavis 09-09-2008 02:52 PM

TDS Calibration
I bought a handheld TDS/temp meter on ebay for under $20 by HM Digital. I've never owned one before, so I don't know much about the maintenance.

The meter is pre calibrated to 342 ppm, but it came with a packet of 1382 ppm calibration solution. Should I recalibrate it with the solution? How often does a TDS meter need to be recalibrated? Also, this solution is in a packet that doesn't reseal. Can the solution be saved in a ziplock or tupperware and reused, or do I need to get new solution every time?


SKAustin 09-09-2008 07:04 PM

Hey Maeve. Unless you believe the meter to be off considerably, I wouldnt worry about trying to recalibrate it. I bought the same meter and tried to calibrate it, but when I did I was surprised to find that there was not nearly enough solution in the packet to do the calibration. If you do calibrate the meter, calibrate it by the "out" setting, as it really doesnt matter what you have going in before the filter. Chances are if you calibrate one, the other will be off, so better to have the output be the accurate reading so you have an idea when to replace components of the filter. As for saving the solution, again, I wouldnt bother. Look for a local hardware store to buy larger quantities in a resealable bottle.

Is this being used for an RO/DI??

aunt kymmie 09-09-2008 07:58 PM

I'm curious....besides temp & high accuracy ph what else does it test for?
I looked it up on the internet and I'm still not sure....

SKAustin 09-10-2008 12:23 AM

Basically, TDS is the measure of all the garbage in the water. Here's the wiki-411


Originally Posted by Wikipedia
Total Dissolved Solids (often abbreviated TDS) is an expression for the combined content of all inorganic and organic substances contained in a liquid which are present in a molecular, ionized or micro-granular (colloidal sol) suspended form. Generally the operational definition is that the solids must be small enough to survive filtration through a sieve size of two micrometres. Total dissolved solids are normally only discussed for freshwater systems, since salinity comprises some of the ions constituting the definition of TDS. The principal application of TDS is in the study of water quality for streams, rivers and lakes, although TDS is generally considered not as a primary pollutant (e.g. it is not deemed to be associated with health effects), but it is rather used as an indication of aesthetic characteristics of drinking water and as an aggregate indicator of presence of a broad array of chemical contaminants.

okiemavis 09-10-2008 05:07 PM

Yeah, it doesn't test pH- that would be a pH meter. I happened to get one that also tests for temperature, but Total Dissolved Solids is the main thing I got it for.

You can also get handheld pH meters, gh, kh, etc. It's pricey for someone with only a few tanks, but is a huge money/time saver when the tanks start piling up.

I got the TDS meter mainly cuz I thought it would be a convenient thing to have. I'm about to start using a "no water change" system, and wish to be able to monitor the TDS. I'm also planning a fish collecting trip to the Peruvian Amazon, and I want to be able to take the info of the river for the fish I'm collecting.

aunt kymmie 09-10-2008 05:59 PM

Thanks for the info, both of you.

A trip to Peru for fish collecting? How fun & interesting.
Any more details of the trip? What types of fish you're after? Time of year you are going? Solo or with a group?
It sounds positively fascinating!

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