It has never been so easy to measure and adjust your Optimist mast rake before your training or regatta. Place the special hook in the top-aft of the mast and measure the distance to the edge of the deck. The blade shows imperial units (inches) and metric units (centimeters).
 
FEATURES
– Belt clip
– Wrist strap
– Rubber thumb lock
– Blade 3m/10ft long
– ABS + Rubber case