DFRobot Gravity Formaldehyde HCHO Sensor an157 A rotating bench holder that

A rotating bench holder that grips a PCB or small workpiece so both hands stay free for soldering

Is this a good choice for learning and prototyping

Q2: Why do people use breadboards

Convenient for control

ESP-01 (512 KB) vs ESP-01S (1 MB) — which should you choose

DFRobot Gravity Formaldehyde HCHO Sensor an157 A rotating bench holder thatMeasure Chemical Conditions with a Sensor Made for Embedded Projects The Formaldehyde HCHO Sensor Gravity is an environmental sensor designed for water quality work, lab projects, and environmental monitoring. It is a practical fit for makers, students, and engineers who want reliable sensor data in embedded builds. Key details include Detection Range: 0~5ppm; Input Voltage: 3. 3~6V; Output Signal: Optional DAC(0. 42V,for 0 5ppm) or UART(9600).