u/Routine-Page2943

Hi everyone, I'm working on a 30-day research project where I need to detect nitrate and ORP in my soil, but I cannot afford anything that's too out of my budget (150 - 200 USD). For ORP, I've found the Aquasol ORP meter or the HM Digital ORP-200 which seem to be the only available handheld meters I can get, though for Nitrate I'm pretty stumped.

I've read that you could use a distilled water and soil extract for an Aquarium test for Nitrate, but I wanted something that was accurate enough for credible research. I would really appreciate any suggestions regarding Nitrate and ORP tests that could be done at home.