a simple clinometer made from paper

clinometer diy hypsometerclinometer hypsometer instrument measurement carbon storage equipment measuring outdoor scale tool accuracy meter green object research survey jungle ecosystem angle work design tree activity forest educational dial people measure graduation quality science gauge looking maths closeup technology high concept sustainable lifestyle mathematic calculating trigonometry simple paper device easily height objects trees buildings tall principles pythagoras#39aph39# theory leaf flower spring person plant yellow branch clothing art photograph grass sunlight autumn hand nature man