Suunto PM-5/360 PC OPTI Clinometer Gear Bags The octo mouthpiece goes into

The octo mouthpiece goes into the cloth

Rather than use a traditional quick disconnect fitting

Good face seal and great comfort

Ideal for swimming

Suunto PM-5/360 PC OPTI Clinometer Gear Bags The octo mouthpiece goes intoScales 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