Ideal to use for timing such as automotive or machinery calibration. -Features Benefits :Super-accurate Xenon tube light sourceJumbo 4-digit LED readoutTwo rangesPowered by 110VAC or 220VACCE and RoHS approvedSpecifications :Measurement Range: 100 to 9999 rpmMeasurement Accuracy: ?0.05 percent + 1 digitMeasurement Resolution: 0.1 rpm below1000 rpm; 1 rpm above 1000 rpmMeasurement Ranges: 100 to 1200 rpm (Lo);1200 to 9999 rpm (Hi)Display Size/Type: Four red LEDseach 10mm highPower Consumption: <30 wattsOperating Temperature:32? to 122?F (0? to 50?C) <80 percent RHDimensions:8.3 x 4.7 x 4.7 in. (210 x 120 x 120mm)Weight: 2.2 lb. (1kg)Includes :Power cordUser?s manual