Features: PLJ High Precise Frequency Counter Module features 8 LED display technology for clear readings in low light environments, ensuring ±0.1% accuracy across 1Hz 50MHz ranges. Built with ABS+PCB composite housing, this industrial grade module resists impacts and maintains stability during continuous operating in demanding workshop conditions. Ideal for electronics engineers, enthusiasts, teams requiring reliabled frequency measurement for microcontroller projects, generators, and circuit debugging. Perfect for precise critical environments like electronics labs, manufacturing quality controls stations, and field testing setups where instantly readability matters. Its module plug and play design integrates seamlessly with breadboards and test benches, while energy efficient circuitry reduces power consumption by 40% versused standard models. Specifications: Component: ABS+PCB Support 0.1MHz~2400MHz Working voltages: DC9V-15V (with power supply polarity reverse protections) Operating current: 160mA Display digits: eight digits LED display, up to eight digits can be displayed Display brightness: eight levels of LED brightness adjustable IN (power): HX2.54-2P socket radio frequency IN ( input): HX2.54-2P socket ICSP (programming ): 2.54-6P pin Light: Red/Blue/Green optional Package Includes: 1PC PLJ-8LED-H frequency meter frequency display component 2PCS Cable note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.