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The Extech RHT20 records humidity and temperature with a nice LCD display. Calibration certificates are available
| Range | Resolution | Accuracy (%rdg+digits) | |
| Temperature | -40 to 158°F | 0.1°F/°C | ±1.8°F (14 to 104°F) ±3.6°F (all other ranges) |
| -40 to 70°C | ±1.0°C (-10 to 40°C) ±2.0°C (all other ranges) | ||
| Humidity | 0 to 100%RH | 0.1%RH | ±3%RH (40 to 60%) ±3.5%RH (20 to 40 & 60 to 80%) ±5%RH (0 to 20 & 80 to 100%) |
| Datalogging interval | 1 second to 24 hours | ||
| Memory | Temperature: 16,000 points; Relative Humidity: 16,000 points | ||
| Dimensions | 3.7 x 1.9 x 1.2" (94.4 x 48.9 x 31.2mm) | ||
| Weight | 3.2oz (90.7g) | ||
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