For water and air speed measurements.

• Displays instantaneous, maximum or averagespeed + instantaneous, maximum, or minimumtemperature or wind chill
• Speed units: kmph, m/s, knots, mph, fps andcm/s
• Backlitdisplay
• Aluminum bottom plate for tripod attachment
• Waterproof
• CE and RoHS approved

Temperature Measurement Range/Accuracy:-4° to 158°F (-20° to 70°C)/±0.38°F (±0.2°C)Air/Water Speed Measurement Accuracy: ±2%Dimensions: 6.1 x 2.6 in. (155 x 65mm)Power Source: 2 AA batteries (included).