Data logger Grant Insruments 2YL-M90-4M with 1 x internal sensor and 2 x external outputs, suitable for measuring temperature, humidity, condensation, voltage and currents and light, can hold up to 4 million readings
| Internal sensors: | 1 | |
| External sensors: | 0 | |
| External inputs: | 2 | |
| Thermocouple: | 0 | |
| Temperature: | Yes | |
| Humidity: | Yes | |
| Condensation: | Yes | |
| Pressure: | No | |
| Voltage and current: | Yes | |
| Pulses: | No | |
| Light: | Yes | |
| Memory: | 4000000 | |