2in1 design, this product ingeniously integrates digital multimeter, and signal source functions in one device. Equipped with a 2.8-inch color display. Multifunctional design, as signal generator can generate sine waves, square waves, combination waves, scanning waves, scanning waves and other waveforms; support coil control and waveform signal storage. As a multimeter, it supports DCVoltage, ACVoltage, resistance, diode, on-off, capacitance, frequency, duty ratio test function. Suitable for accurate car maintenance and audio coordination. Features: 2in1 Design with 2.8 Inch Color Display: This product ingeniously integrates digital multimeter and signal generator functions into one device. 2.8-inch color display, with 320*480 resolution, and 5%-100% screen brightness adjustable. Multimeter Function: It supports DCVoltage, ACVoltage, resistance, diode, on-off, capacitance, frequency, duty ratio test function. Supports 4000 counts True RMS function. Signal Generator: Built-in waveform signal generator, it can generate sine waves, square waves, combination waves, scanning waves, scanning waves and other waveforms. Support coil control and waveform signal storage. Manually Parameters Setting: Support setting VP-p, time, frequency, voltage output, to meet different testing needs. By manually setting these parameters, the user can better control the testing process to achieve optimal test results. Coil Control: Check if the ignition coil is normal, support ignition coil control, solenoid valves control, relay control (support 30V/1A and below coil control), that means it can be applied to most low voltage equipment testing. Scanning Waves Output: It is equipped with a function to generate analogue crankshaft cam signals from low-speed to high-speed operation. Suitable for audio maintenance and coordination circuit maintenance. Combined Waves Output: Support combined waves output, it can be arbitrarily set missing teethsignal without connecting to the computer. Maximum number of combined waves: 99+99. Waveform Signal Storage: Manually adjusting waveform signal parameters allows for storage and loading. 50 sets of waveform parameters are stored. Specifications: Name: Signal Generator Multimeter Material: plastics Model: ET31C, ET32C(optional) Battery: according to your selection ET31C: 3 * AAA battery (not included) ET32C: built-in lithium battery (included) Output voltage: -12 to 12 V Frequency output: 1Hz to 9999Hz Maximum combinedwave number: 99+99 Coil control support: Up to 30V/1A Item size: 134 * 69 * 25mm / 5.28* 2.72 * 0.98in Package size: 160 * 100 * 100mm / 6.30 * 3.94 * 3.94in Package weight: 300g / 10.58ounce Packing List: 1 * Signal Generator Multimeter 2 * Test Leads 1 * Probe 1 * User Manual