The HC-SR04 ultrasonic sensor uses sonar to determine distance to an object like bats or dolphins do. It offers excellent range accuracy and stable readings in an easy-to-use package.
Product Name: IMAX RC B3 Pro Compact Balance Charger for 2S 3S 7.4V 11.1V Lithium LiPo Battery.
PCB Spacer Standoff 3mm Nylon Plastic stick on
LIPO battery Voltage Tester and Low Voltage Buzzer alarm 1-8 Cell LED Display.
It can be used for rework, sphere or pin attachment to BGA, PGA and CSP packages, and assemble operations such as Flip Chip attachment to PWB substrates.