DIY Rain Gauge
| Min number of participants | 1 |
| Age | 5+ yrs. |
| Safety support by adult | Not required |
| Min duration | 20 min. |
| Cost | None (Free) |
| Environment | Indoor |
Cut a plastic bottle, mark a measurement scale with a ruler, and set it in the garden — then read it each morning after rain and log the results in a weather journal. A tiny science project with big results.