| Variable | Method | Range | Accuracy |
| Temperature | Based on a negative temperature coefficient thermistor that measures the ambient air temperature. | 30˚C - 50˚C (22˚F - 122˚F) | ±15˚C (±2.7˚F) @ 2 knots (2.3 mph) wind speed |
| Pressure | Measured using a temperature-compensated silicon piezoresistive pressure sensor. | 850 - 1150 mbar (25 - 34 in Hg) | ±1.5% |
| Humidity | Measured with a capacitive cell humidity sensor. | 10% - 95% RH | ±4% |
| Wind speed | Ultrasonic anemometer. | 0.5 - 99.5 knots (0.6 - 114.5 mph) | The greater of ±1 knot or ±4% (±1.1 mph) |
| Wind direction | Ultrasonic anemometer. | 0˚ - 360˚ | ±1.5˚ |
| Particle counts | Particle spectrometer (655 nm laser diode). | 0.25 - 32 μm in 32 size bins | ±3% |