Spartna SPR-101 is a 9-in-1 environmental meter that can measure air velocity, air flow, air temperature , Type-K temperature, heat index, and humidity. It also offers wet bulb, dew point, windchill, and light level measurements. The SPR-101 includes a built-in, replaceable low friction ball bearing mini vane wheel, a precision photo diode with cosine and color correction filter, and a capacitive humidity sensor for high accuracy.