The SpotOn® Inversion Tester allows for quick and accurate detection of low-level thermal inversions and measures air temperature at boom height as required for pesticide/herbicide application. Even a slight inversion can ineffectively treat the desired area. Fine droplets of the chemical can get trapped in the cooler air near the ground and become isolated from the surrounding weather conditions. The meter clearly states if an inversion is present (warm air above cool air) on the digital display.