Features: Model: 0-10A, 0-50A, 0-100A (optional) Dual display-red and blue LED display, voltage and current display at the same time Two thin cables for connecting 3.5-30V power supply. The voltage is measured with a thick black wire and a thick red wire. The amperage is measured between the thick black line and the yellow line. Product parameters: Working current: <20mA Measuring voltage: DC 0～100V Minimum resolution (V): 0.1 V Minimum resolution (A): 0.01 A Display: three 0.28" LED digital tubes Display color: red + blue (dual display) Dimensions: 48 x 29 x 21 mm Refresh rate: approx. 500 milliseconds/time Measurement accuracy: 1% (±1 digit) Working temperature: -10-65℃ Humidity: 10% to 80% (non-condensing) Working pressure: 80 to 106 kPa Wiring: Black wire (thin): Negative pole of empty or step-down circuit (module) Red line (thin): power supply + Black cable (thick): COM, common measurement Red cable (thick) Measuring input current (+) Yellow cable (thin): measure the input voltage (+) Note: Package list: 1 * Dual LED digital voltmeter ammeter (optional) notes: 1. Due to various factors such as display brightness and light brightness, the actual color of the product may be slightly different from the website picture. 2. Please allow a slight deviation between the data and the manual measurement.