... measuring range and high resolution. Product Description Amittari Photo/Contact Tachometer used to test the rotative velocity ,surface speed or ... frequency of motor.Widely applicable to motor, fan, paper-product ,plastics,chemical fiber,washing-machine,automobile,airplane,steamer ... in memory.* Multifunctional, one instrument combines PHOTO TACH. (RPM) & CONTACT TACH. (RPM , m/min., ft/min). * The use ...