LBRNO Digital Professional Automatical Switchover Non Contact Laser Photoelectric Photo Type Tachometer Large LCD displaying. Wide measuring range & high resolution. The use of durable. Dimension: approx. 131 (L) x 70 (W) x 29 (D) mm. The RPM of motors and machine parts. The housing has been carefully shaped to fit comfortably in either hand. The last value/min . Value will be automatically stored in memory and can be displayed by turn anytime. Display: 5 digits, 18 mm LCD with Function Annunciation. Digital display gives exact RPM with on guessing or errors. It is a great tool to measure.