If you're helping students set up environmental sensors for science projects, you've probably seen this: the data looks great until you realize the temperature is off by three degrees or the CO₂ sensor drifted after two weeks. In this episode, Kazuki Tanaka walks through the complete calibration checklist he uses in schools and makerspaces to turn budget sensors into research-grade instruments. You'll learn how to validate hardware, build reference standards for under twenty dollars, run two-point calibrations that cut error by eighty percent, and document everything so the data actually counts as science.

• Before you calibrate anything, check your sensors for physical damage like tiny cracks or bad solder joints, because one in fifty budget sensors has a defect that looks like a calibration problem but isn't, and you'll waste weeks  ...