HAGA ALTIMETER
Height and slope measurements are made simple with these six scales:
1 chain = 66' 66 ft. -27' to + 144'
15 15 ft., yds., or m -6 to + 26 ft., yds., or m
20 20 ft., yds., or m -8 to + 34 ft., yds., m
25 25 ft., yds., or m -10 to + 43 ft., yds., or m
30 30 ft., yds., or m -12 to + 52 ft., yd