Description DUOYI DY2201C Digital Multimeter Engine RPM Voltage Resistance Automotive Diode Ignition Circuit Tes The product is shipped based on the color or size of the main image of the product page. DUOYI DY2201C Digital Multimeter Engine RPM Voltage Resistance Automotive Diode Ignition Circuit TesDescription: DUOYI DY2201C Automotive multi-functional meter,is suitable for professional auto detection and repair, engineering design,testing, production test, is your ideal portable automobile repair and maintenance tools. The sophisticated design, convenient operation, accurate readings, complete functions,the use of new protective sleeve and large screen liquid crystal display, Jack in the input end is connected with the PTC thermistor element to the instrument core components, function / range switch protection especially for fully In order to further prevent error operation, on the current measurement Jack adopts mechanical protection device,only in the selection of current measurement, corresponding to the mA or 20A Jack will be open,otherwise is blocked by the baffle plate, effectively avoid the wrong one, greatly improving the safety of the products and service life. Features: AC/DC voltage current Resistance test diode PN junction voltage measurement Circuit switching,transistor test Temperature measurement() 2 stroke/4 stroke engine speed measurement(Unit: RPM) Frequency measurement(Unit: Hz) Duty ratio measurement( percent ) Pulse width measurement (unit: ms) Ignition dwell angle measurementLarge LCD display, size in 7048mm,high contrast, 28mm character height,clear and pleasing.LCD with white back light, convenient in dark environment operation.Maximum display 1999 for 31/2 digit,AC and DC voltage, current, resistance 19999 for speed, frequency, pulse duration, dwellAutomotive multimeter meet IEC1010-1 safety standards, double insulation Specification: DC voltage 20-1000V accuracy: 0.5 percent DC current 20mA-20A accuracy: 1.5 percent AC voltage 20-700V accuracy: 1.0 percent AC current 20mA-20A accuracy: 2.0 percent Measuring of motor dwell angle: 0.1 -360 (1/2/3/4/5/6/8 cylinder)Measuring of motor speed:300RPM-19999RPM(2 Stroke)600RPM-19999RPM(4 Stroke)Impulse time measurement:0.1mS - 1000 mSMeasuring temperature: -40 -1000Frequency measurement:2-20kHz.Maximum display:1999 (31/2 digit,AC and DC voltage, current, resistance)19999(Speed, frequency, pulse duration, Dwell)LCD display size: 7048mm , 28mm character heightPower supply: a 9V battery (NEDA1604, 6F22 or equivalent), battery not includeWorking temperature: 0 -40 Relative humidity