Extech 45158 Mini Waterproof Thermo Anemometer and Humidity Meter Pocket design meter with flip style case acts as extension handle and protects meter during storage Displays air velocity and either relative humidity, dew point or temperature on dual display Measuring range 100 to 5500feet/min Choice of readings in feet/min, meters/second, kM/hour, MPH or knots Rugged water resistant housing floats