DT-618 Features: Measurement of Wind Velocity and Temperature, Holding the Reading and Finding the Max./ Min 1. Sensitive and Accurate (ultra low friction jewel bearing) 2. Ergonomic and easy-to-use design 3. Read while measuring (detached vane) 4. Large digits LCD (Liquid Crystal Display) 5. 2 meters coiled cable and mounting nut for long extension 6. Low power consumption 7. Data/ Max/ Min hold function 8. Building-in low battery indicator Bearing: Sapphire jewel bearing Temperature sensor: K-type thermocouple Operating Temperature: 0~50°C (32~122°F) Operating Humidity: Less than 80% RH Storage Temperature: -40°C~60°C (-40°F~140°F) Battery Type: 9V Battery Life: 50 hours (for 300mA-hrs battery) Averaging Period for Wind Speed Measurement: m/ s: 0.6sec. (approx.) knots: 1.2sec. (approx.) km/ hr: 2.2sec. (approx.) DT-618 Specifications: Range of Wind Velocity: | - | Range | Resolution | Threshold | Accuracy | | m/ s | 0.0 ~45.0 | 0.1 | 0.3 | ±3% ±0.1 | | knots | 0.0 ~ 88.0 | 0.1 | 0.6 | ±3% ±0.1 | | Km/ hr | 0.0 ~ 140.0 | 0.1 | 1 | ±3% ±0.1 | m/ s: meter per second knots: nautical miles per hour Km/ hr: kilometers per hour Unit Conversion table: | - | m/ s | knots | Km/ hr | | 1 m/ s | 1 | 1.944 | 3.6 | | 1 knot | 0.5144 | 1 | 1.8519 | | 1 Km/ hr | 0.2778 | 0.54 | 1 | Range of Temperature: | - | Range | Resolution | Accuracy | | °C | 0 to 60.0 | 0.1 | +2°C | | °F | 32.0 to 140.0 | 0.1 | +4°F | Dimension: Meter: 150x 72 x 35mm Vane: 66x 132 x 29.2mm Weight: 350g (battery included) |