# Test #4 with Sorbent #1 ![](/files/RqvYDol7cQ260jHEDRAa) Notes: My second success! The ppm changed when I lowered it into the water! This proves that MK3 is much better than MK2 (because of the ability to "add" and "remove" water). Unfortunately, the sensor broke partway through, so the test had to stop. I also think my sensor was uncalibrated because the readings were pretty far off from what they should be, seeing as I subjected the chamber with air supplied from indoor air, which has levels of 1000-1500 ppm. This doesn't mean that the sensor can't sense an increase in CO2, though, so I would still label this a success. Time water added: 9:31 Time water taken away: 9:33 Start ppm: 742 End ppm: 805 Rise ppm: 63 (just in 13 minutes!) Total time frame: 19 min Experiment time frame: 13 min Test chamber: MK3 --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://nicholsonlabs.gitbook.io/labs/carbon-capture/tests/test-4-with-sorbent-1.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.