* Multifunctional, one instrument combines PHOTO TACH.(RPM) & CONTACT TACH. (RPM , m / min, ft / min ). * Digital display with no guessing errors. * Wide measuring range and high resolution. * The last value / max. value / min. value will be automatically stored in memory. * The use of durable, long-lasting components, including a strong, light weight ABS-plastic housing assures elegant shape and ease of use.