Specifications: Measurement Range: RPM: 3 to 99,999; M/min: 0.3 to 19,999; Ft/min: 0.3 to 19,999; time-interval: 0.01 to 99,999 sec. Counts: 1 to 99,999. Display: 5 digit red LED, 0.4" (10.5mm), floating decimal in autorange mode. Display Update Time: 0.8 second above 75rpm, time between pulses below 75rpm. Accuracy: RPM: +/-0.05% of reading, +/-1 digit; M/min & Ft/min: +/-2% of reading. Time Base: crystal controlled. Auto/Fixed Ranges: user selectable via yellow switch. Resolution: Rate, fixed decimal mode: +/-1 digit; Rate, Autorange: maximum 0.001 units (revs/meters/feet); time modes: max. 0.01 sec., autoranging only; count mode: 1 count (1 pulse/shaft rev. in contact mode). Auto Power-Off: after release of button, reading displayed for 10 seconds then switches off. Memory Recall: last reading available for up to 1 minute after automatic power-off. Over Range: display flashes. Under Range: display reverts to zero (rate modes). On Target Indicator: green LED glows when optical alignm