| Anemometer | Velocity of wind |
| Cardiogram | Heart movements |
| Encephalograph | Brain movements |
| Crescograph | Plant growth |
| Gravimeter | Oil deposits under water |
| Fathometer | The depth of the ocean |
| Hygrometer | The humidity in air |
| Lactometer | Purity in milk |
| Pyrometer | High temperature of distant objects |
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