Suunto PM-5/360 PC OPTI Clinometer Dive Knives This subframe provides incredible strength

This subframe provides incredible strength and rigidity as well as eliminating the bulky external plastic frame in other masks

and Terra models

L/B Northern Hemisphere Compass

Includes ruler (cm and inches)

Suunto PM-5/360 PC OPTI Clinometer Dive Knives This subframe provides incredible strengthScales for slope in degrees and % Accurate measurement of heights and slopes Optical reading of card for higher accuracy The compact hand held Suunto PM 5 clinometer allows to measure heights, slopes, and angles from a variable distance quickly and with high accuracy. This particular model uses a percentage scale. The liquid inside the tool wont freeze or evaporate as long as you stay within the 30 C to +60 C 22 F to +140 F temperature range. Sturdy