Raspberry Pi Zero 2W with Header

Panasonic AAA Battery 2 Pack

philips 9v battery 

UC3843AN, PWM Controller

LM833N DIP-8 Amplifier Audio Integration Dual Operational Amplifiers

24k 1/4w carbon film resistor

line tester pen screwdriver wh-991 144mm 3mm

DC12V 2-way wireless remote control switch 433mhz with 2 remote controls

INK2200 Electronics Conductive Pen

DFRobot Gravity Analog TDS Total Dissolved Solids Sensor Meter 3.3~5.5V Compatible for Water Quality Testing

ZT300AB Multimeter Auto/Manual Range Digital Universal Meter 6000 Counts True RMS Smart AC/DC Voltage Current Meter

Metal Detector Kit Electronic Soldering Practice Kit Non-Contact Sensor Board Module Electronic Part Metal Detector DIY DC 3V-5V 60mm