**Conductivity** is a measure of a solution's ability to conduct electricity, as measured in Siemens per meter (S/m). (lead image by @ddileona) This page is under development, please add background info: * Info about regulations * Info about ecological or human health impacts * Advocacy leverage points * Constraints we're working within: cost, complexity, sensitivity, time Also see resources on this page: https://publiclab.org/wiki/conductivity_sensing ## Questions [questions:conductivity] **** ## Sensors Here's a list of different conductivity sensors and measurement systems. Also see below for some Do-It-Yourself approaches to measuring conductivity, and [this page](https://publiclab.org/wiki/conductivity_sensing) for more information. * [the Coqui](/wiki/coqui) **** ## Activities Activities for people to test methods (these develop over time) [activities:conductivity] **** ## Existing work [notes:conductivity] ...
| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| warren | "Hi! I made a bookletized version of the pdf for printing on half-letter-sized paper -- Booklet_Sensor_Journalism_Final.pdf " | Read more » | about 6 years ago | |||
| warren | "@kanarinka - we're planning to order a bunch of these to test out at MakeFaire SF at the end of may -- getting ready for a big order, and printing ..." | Read more » | about 6 years ago | |||
| warren | " " | Read more » | about 6 years ago | |||
| warren | "Awesome!!! " | Read more » | over 6 years ago | |||
| MadTinker | "Ran across this article that discusses at a high level the relationship between salinity, TDS, and conductivity. Reference . It specifically mentio..." | Read more » | over 6 years ago | |||
| MadTinker | "Confirm? Hmmm... well, I have two data points, both of which coincidently use the same multiplier on EC to get TDS. From discussions with folks wh..." | Read more » | over 6 years ago | |||
| warren | "@stevie - maybe this could at some point be a good kit for students to use? Pretty cool, @MadTinker !! Interestingly the TDS pen also converts to ..." | Read more » | over 6 years ago | |||
| MadTinker | "An quick update: The TDS sensor from DFRobots performs as describes. Very easy to connect to the MiniPearl logger. In general, it collects a voltag..." | Read more » | over 6 years ago | |||
| Ag8n | "You hit the nail on the head with auto correct. Good luck with your project. " | Read more » | over 6 years ago | |||
| MadTinker | "@Ag8n - yes, I saw the other discussion, but it had seemed to go on a tangent. ‘crazy’ @cfastie I think hits it right on the head (gotta love that ..." | Read more » | over 6 years ago | |||
| Ag8n | "There are several other previous questions that discuss this. But crazy is is correct, all tds meters are conductivity meters. One side note- ther..." | Read more » | over 6 years ago | |||
| cfastie | "I agree that the DFRobot TDS sensor looks like a useful device at a good price. My lame understanding is that this and other sensors which purport ..." | Read more » | over 6 years ago | |||
| WaterGeek | "Great work and super useful for citizen's looking to track the quality and state of open water. We've been looking into something like this for dri..." | Read more » | over 6 years ago | |||
| warren | "I love this idea. Here are some leads on connecting a TDS meter to an Arduino, if that's what you're interested in: https://forum.arduino.cc/index..." | Read more » | over 6 years ago | |||
| warren | "wow!!! This is very cool. Here's an amazon link: https://www.amazon.com/s/?tag=duc0c-20&url=search-alias%3Daps&field-keywords=tds%20aquarium " | Read more » | over 6 years ago | |||
| Ag8n | "I checked Amazon. There are several tds meters that also do conductivity for a price of under $20. Since a scientific model lists for about $1000,..." | Read more » | over 6 years ago | |||
| Ag8n | "Sorry. Truncated the internet address: Https://www.hydroponics.net/learn/debate_over_ec_and_tds.php " | Read more » | over 6 years ago | |||
| Ag8n | "Check out: Https://www.hydroponics.net/lear All tds meters are conductivity meters, but according to the article, they may not all use the same c..." | Read more » | over 6 years ago | |||
| Ag8n | "I think it is. Was hoping someone was more familiar than me. Different websites talk about charge and others about conductivity, which can be two..." | Read more » | over 6 years ago | |||
| gretchengehrke | "Hi @Ag8n, Do you know how the aquarium TDS meter works? Maybe it really is just a super cheap conductivity meter? " | Read more » | over 6 years ago | |||
| EdMallon | "Thanks xose! Its been a long road, and we documented the entire process on the blog over time, including the mistakes. Now we are working towards..." | Read more » | over 6 years ago | |||
| xose | "Guys, all of you specially Ed, this thread is awesome! " | Read more » | over 6 years ago | |||
| Markos | "Hi, There are two types of current that can be generated when two conductive materials are dipped into the water. 1- Faradaic current 2- Non Farad..." | Read more » | over 6 years ago | |||
| Ag8n | "I have never met a conductivity meter that doesn't have some amount of drift. Having said that, the commercial conductivity meter at work was a lo..." | Read more » | over 6 years ago |