Digital Laser Photo Tachometer Non Contact RPM Tach Meter Motor Speed Gauge Large LCD displaying Wide measuring range & high resolution. Digital display gives exact RPM with no guessing or errors. Wide measuring range & high resolution. The use of durable, long-lasting components, including a strong, light weight ABS-plastic housing assures maintenance free performance for many years. The housing has been carefully shaped to fit comfortable in either hand. The last value/max. value/min. value will be automatically stored in memory and can e displayed by turn anytime.