Instrument for measuring soil humidity at research station ?La Selva? in Puerto Viejo de Sarapiqui, Costa Rica

natural reserve natural area tropical rainforest undergrowth scientific research scientific instrument measure high angle view overview day humidity botany top view march month humus matter humus soil nobody la selva biological station nature reserves nature reserve nature natural areas ecosystem ecosystems tropical rain forests ombrophile forest shade plants rain forest rainforest rain forests ombrophile forests scientific researches scientific studies scientific study scientific instruments scientific material scientific materials scientific study material scientific studies materials scientific measuring instrument scientific measuring instruments laboratory instrument measured measuring high angle shot overhead shots overhead shot overhead sight overhead sights overhead view overhead views overviews global sight global sights full length days daytime moisture humidities damp botanies top views top sight top sights view from above top shot with nobody estación biológica la selva environment protection environment management biodiversity management environment naturalness area tropical forest forest science shot ambiance discipline organic matter matter substance earth's crust individual heredia province costa rica central america america