Measures Degrees and percent of slope. The world-famous Suunto Clinometer is a hand held instrument used for making precise measurements of vertical angles. Foresters all over the world consider and use the Suunto Clinometer more than any other for measuring tree height and slope. FEATURES: Jeweled bearing assembly scale card. Dampening liquid surrounds scale card and speeds up reading. Parallax-free lens magnifies scale and card reading. Complete with metal ring for cord.