After welding, you have a practical ultrasonic rangefinder kit.Real-time measurement is displayed on the digital tube, and the corresponding LED light light up to display more intuitive data.Additionally, when the measured distance is below the set threshold, the electronic kit issue a warning beep to remind you immediately. Measuring distance from 0 to 270 cm.The first LED light light up when the distance exceeds 30 cm, and all LEDs light up when the distance exceeds 270 cm.Customize obstacle avoidance distance with two simple buttons for quick adjustment (increase or decrease).This DIY welding kit is not only a great way to learn electronics, but also a practical tool for everyday use. The ultrasonic ranging system reflects sound waves when encountering obstacles.The -SR04 ultrasonic sensor measures the time difference between transmitting and receiving ultrasonic waves to calculate the distance between the obstacle and the sensor. Connect clearly mapped and marked on the circuit board for easy soldering.Apart from teaching basic mechanical and electronic , this welding practice kit is suitable for beginners and attracts all skill levels for hands-on projects, STEM learning and detection applications! This welding exercise kit includes a color printed user manual (not necessarily supported in Chinese), which guides you through the installation process , with clear graphics and text.It's easy to assemble.But please note that this welding kit requires a certain basic electronic knowledge and welding and hands-on ability.<br><br>Colour: AS Shown Material: Plastic<br><br>Package Contents: 1 pcs x soldering practice kit<br><br>Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.