Description Pocket size, compact design Measures: air velocity, temperature, humidity, dew point, wet bulb, wind-chill and ambient temperature Selectable wind units: KNT (Knot), BF (Beaufort), ft/m (feet per minute), M/h (mile per hour), m/s (meter per second), km/h (kilometer per hour) Selectable temperature units °C or °F Max wind speed display Quick measurement response External temperature probe Easy, two-button operation Data hold Auto power off with disable feature Low battery indication Ergonomic design with a wrist strap Specifications Features TMA5 Wind speed range 0.5 → 44.7 mph, 60 → 3937 ft/m, 0.4 → 38.8 knt, 1.1 → 20.0 m/s, 0.7 → 72.0 kmh, 1 → 8 BF Air temperature range 32 °F → 122 °F (0 °C → 50 °C) External temperature range -4 °F → 158 °F (-20 °C → 70 °C) Air RH% range 5 % → 95 % RH Wind speed response Averaging every 2 seconds Temperature response time 60 seconds (typical) Air RH% response time 60 seconds (typical) Wind-chill display • Dew point temperature • Wet bulb temperature •   Specifications Wind speed range: 0.5 – 44.7 MPH, 60 – 3937 FT/M, 0.4-38.8KNT, 1.1-20.0 M/S, 0.7-72.0KMH, 1-8 BF Wind speed accuracy: /-5% of reading or last significant digit (whichever is greater) Air temperature range: 0°C to 50°C (32°F to 122°F) Air temperature resolution: 0.1°C/°F Air temperature accuracy: /-1°C ( /- 30.2°F to 33.8°F) External temperature range: -20°C to 70°C (-4°F to 158°F) External temperature resolution: 0.1°C/°F External temperature accuracy: /-0.6°C ( /- 31°F to 33.1°F) (-20°C to 50°C / -4°F to 122°F), other ranges /-1.2°C (29.8°F to 34.2°F) Air RH% range: 5%RH to 95% RH Air RH% resolution: 0.1% RH Air RH% accuracy: /-3.5% RH (at 25C, 10 – 90% RH, other ranges /- 5% RH) Wind speed response: Averaging every 2 seconds Temperature response time: 60 seconds (typical) Air RH% response time: 60 seconds (typical) LCD update: Every second Wind-chill display: Yes Dew point temperature: Yes Wet bulb temperature: Yes LCD size: 21(H)x 34(W) mm Battery: CR2032