... .4.reliable quality Propeller shaft revolution indicator 600~600Rmp for ships.Model No.: 45C3available for:600~600R,300~300R,900~900RDescription:1 ... , reflective words;2. WHL :120*120*118mmTechnical instructions:(1)Range:600~600R/minute; (2) Accuracy class: 1.5;(3) pointer Angle ... function, shock& impact (10kg), friction resistance. Propeller shaft revolution indicator 600~600Rmp