Features: • Measure RPMs from 5 to 99,990rpm with microprocessor quartz crystal accuracy of 0.05% + 1digit • Resolution from 0.1rpm (5 to 1000rpm) to 1rpm (1000 to 9999rpm) to 10rpm (10,000rpm to 99,990rpm) • Large 4 digit LED display updates once per second (rpm greater than 60) • Unique design permits RPM measurements of a one hole gear or disk eliminating the need for special gears • A pulse is measured when a ferrous object (stud) passes by sensor • Powered by: 115/230 VAC 50/60Hz Dimensions: Bezel: 3.78 x 1.89 x 2.36" (96 x 48 x 60mm) Meter: 3.61 x 3.54 x1.66" (92 x 90 x 42mm) Weight: 13.9oz (397g) Panel cutout: 3.62 x 1.77" (92 x 45mm) • Choice of two sensor pickup types: Proximity sensor designed for target distance of 0.1" (3mm), covers range to 36,000rpm (600Hz); Photoelectric sensor with target distance of 0.4" (10mm) and range to 15,000rpm (250Hz); Both encapsulated sensors include 6 ft. (1.8m) cable