Biometric Monitors
Suunto Clinometer PM-5/360 PC, SS011096010
Professional inclination device for reliable measurements of heights, vertical angles and inclinations Scales for inclination in degrees and percent, Optical reading of the map for higher precision, Made in Finland Adjustable dioptre compensation, 0.5°...
https://www.bizrate.co.uk/biometricmonitors/suunto-clinometer-pm-5-360-pc-ss011096010-oid1975742100.html