Fertilizer TDS Nutrition and Watering

[IdahoOrchid]

I found this page that has some testers and information:

http://www.watercenter.com/category... Meters, Testers and Probes&Cart=114106376557

I am not sure how we might use this but it does have some good descriptions and instruction:

http://wwwchem.csustan.edu/CHEM2000/EXP6/exp6a.htm

Here is where hand held meter could help get more accurate measurements than the LED indicator in the article. Measure the voltage across the resistor and you should be able to get a finer indication of the solution. Just remember that the strength of the battery can/will have an effect on the result. I imagine the same is true for most other meters unless they are designed to us a smaller voltage than the suppy provides.

Even better, a "cheap" tester that will do both EC and PPM testing:

http://www.labsafety.com/store/item/100723/

Heck, do a seach (I use metacrawler.com) on conductivity tester and you will find ALL and MORE than you ever wanted to know on this.

 

[gonewild]

I found this page that has some testers and information:

http://www.watercenter.com/category... Meters, Testers and Probes&Cart=114106376557

I am not sure how we might use this but it does have some good descriptions and instruction:

http://wwwchem.csustan.edu/CHEM2000/EXP6/exp6a.htm

Here is where hand held meter could help get more accurate measurements than the LED indicator in the article. Measure the voltage across the resistor and you should be able to get a finer indication of the solution. Just remember that the strength of the battery can/will have an effect on the result. I imagine the same is true for most other meters unless they are designed to us a smaller voltage than the suppy provides.

Even better, a "cheap" tester that will do both EC and PPM testing:

http://www.labsafety.com/store/item/100723/

Heck, do a seach (I use metacrawler.com) on conductivity tester and you will find ALL and MORE than you ever wanted to know on this.

This is the one I am using. Cheapest I could find. I works fine. I think all of the cheaper models probably are made the same, just put into a different case. Unless you buy a really good meter you may as well spend as little as possible.

 

[NYEric]

Lance, on the meter what units does it say it measures in, microns/CM3?

 

[Candace]

I had to replace my cheapo Hanna meter that I dropped and broke. I got one on ebay for 9.99 plus shipping. It came yesterday and I'm not going to go through all the calibration stuff as what it states is good enough for my purposes. My R.O. in the greenhouse is 3 and my indoor R.O. for my drinking water came in at 8. Both were around where my last meter read. I've got to keep an eye on my indoor filters and replace. It's been at least 6 months since I've replaced my indoor filter.

 

[gonewild]

Lance, on the meter what units does it say it measures in, microns/CM3?

The one I have says TDS and PPM.

microns/CM3 probably is microSiemens / cubic centimeter which would be in the EC scale.

 

[gonewild]

I had to replace my cheapo Hanna meter that I dropped and broke. I got one on ebay for 9.99 plus shipping. It came yesterday and I'm not going to go through all the calibration stuff as what it states is good enough for my purposes. My R.O. in the greenhouse is 3 and my indoor R.O. for my drinking water came in at 8. Both were around where my last meter read. I've got to keep an eye on my indoor filters and replace. It's been at least 6 months since I've replaced my indoor filter.

Lucky you did not drop an expensive EC meter!

 

[gonewild]

For those of you who still don't understand meters, Here is a link to a page that explains very clearly the difference between EC and TDS / PPM. Go figure the marijuana growers could explain it simply. :clap: