The dark gray Kestrel 4000NV Weather Meter features a backlight, barometric pressure, pressure trend, altitude, relative humidity, heat stress index, dew point, wet bulb temperature, density altitude, wind chill, air/water/snow temperature, current wind speed, average wind speed, maximum wind gust, time and date, exterior temperature and pressure sensor, 4000 data points, graphs and recall trends, data charting, and a flip-top, user-replaceable impeller. Kestrel 4000NV Dark Gray Weather Meter 0840NVOLV