Digital Tachometer Non Contact and Contact Revolution Frequency Meter Handheld RPM Gauge UT372D Item Type: Digital Tachometer Model: UT372D Material: ABS Battery: 3 x 1.5V AAA Battery (battery not included) Use: Widely used in the manufacturing industries of electric motors, fans, paper making, plastics, chemical fibers, washing machines, automobiles, aircraft, ships, etc. LCD Display: 5 digit LCD display, maximum display up to 99999 Overload Display: Displayed in OL Sensor Type: Photodiode and Hall Sensor Speed And Frequency Accuracy: ±(0.02% reading +1 word) Rotation Speed Resolution (RPM): 0.01(1-99.99); 0.1(100-999.9); 1(1000-99,999) Frequency Resolution: 0.1Hz Surface Velocity Resolution: 0.01 (1-99.99); 0.1(100~999.9); 1(1000-99,999) Length Resolution (m): 0.1m circumference runner 0.01(1-99.99); 0.1(100-999.9); 1(1000-99,999) 6 inch circumference runner 0.01(1-99.99); 0.1(100-999.9); 1(1000-99,999) Length Resolution (in): 0.1m circumference runner 0.32(1-99.99); 0.3(100-999.9); 1(1000-99,999) 6 in circumference runner 0.5 (1-99.99); 0.5(100-999.9); 1(1000-99,999) Length Resolution (ft): 0.1m circumference runner 0.02 (1-99.99); 0.1(100-999.9); 1 (1000-99,999) 6 in circumference runner 0.04 (1-99.99); 0.1 (100-999.9); 1 (1000-99,999) Range: Non Contact Type: Rotational Speed Measurement Range (RPM): 1-99999 Frequency (Hz): 1-1666 Counting Range (Times): 1-99999 Contact Type: Rotational Speed Measurement Range (RPM): 1-19999 Frequency (Hz): 1-333 Surface Speed Measurement Range: 0.1m circumference runner; 0.1-1999m/min; 0.4-6,550ft/min; 4-78,700in/min 6 in circumference rotation; 0.15-1, 524m/min; 0.5-5,000ft/min; 6-60,000in/min Length Measurement Range: 0-99999 (m, in, ft)