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EC / TDS meter help

Posted by tampahydro 9 (My Page) on
Fri, Aug 1, 08 at 5:07


Im recently new to hydroponics and have only experimented with organic nutrients that dont require metering equipment.

Can anyone recommend a quality, long lasting and accurate EC/TDS meter? I have searched user ratings, but they seem to vary wildly.

The Bluelab Truncheon looks good, especially since it requires no calibration, as well as a 5 yr warranty. I only found one review which wasnt good, but didnt explain.

Any recommendations or advice would be appreciated. Does not necessarily need pH ability, nor does it need to be the cheapest.

Follow-Up Postings:

RE: EC / TDS meter help

I have used a Truncheon year around for 15 years. It has been dropped in a nutrient tank several times. Except for changing batteries every 5 years, I have done nothing else to it, and it has never failed to work correctly.


RE: EC / TDS meter help

Thanks for your advice. Just picked up a bluelab Truncheon today, and it works great. Interesting to find out there are several different ppm scales in use, with the x500 and x700 being the most common. I also notice many web sources dont differentiate between the two. Guess I should rely on the CF and EC instead.

RE: EC / TDS meter help

It's been mentioned in a couple other threads, so sorry if you've already read this: PPM is never measured. The only thing measured is EC. Some of us still can't figure out why there seems to be a desire to switch EC to a ratio of ppm, which is essentially pointless. The 500 and 700 scales simply mean you take the EC measurement and multiply by 500 or 700 to come up with a crude approximation of ppm of dissolved solids. That doesn't even mean that those solids are fertilizer (though they likely are). The only number that matters is the EC value. The rest depends on your ability/willingness to follow the directions on a manufacturers label. I don't. I use less than GH recommends, just in the same proportions.

RE: EC / TDS meter help

I also just ordered a bluelab Truncheon meter. If it last as long as other's have, it will be worth it.

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