SENSOR

Here is a general breakdown of the sensor categories they carry:

Environmental & Chemical

Temperature & Humidity: Standard DHT-style modules, industrial thermocouples, and precision thermistors.
Air & Gas: MQ-series gas sensors for detecting everything from methane to carbon monoxide, plus general air quality monitors.
Liquid & Water Quality: pH sensors, TDS (Total Dissolved Solids) meters, and various liquid level and float sensors.

Motion, Distance & Proximity

Distance/Ranging: Ultrasonic sensors, IR (infrared) obstacle avoidance, and specialized LiDAR or radar modules.
Movement & Orientation: PIR motion sensors, accelerometers, and gyroscopes for stabilization and orientation tracking.
Navigation: Line tracking arrays and GPS/GNSS modules.

Physical Force & Mechanical

Pressure & Force: Flex/force sensors, load cells, strain gauges, and industrial-grade barometric pressure sensors.
Vibration & Touch: Piezoelectric vibration modules, bump switches, and capacitive touch interfaces.

Electrical & Magnetic

Power Monitoring: Current and voltage sensors (both AC and DC) for battery management or power consumption tracking.
Magnetic: Hall Effect sensors, frequently used for calculating motor RPM or acting as non-contact limit switches.

Specialized & Biometric

Human Interface: Fingerprint/biometric scanners and ECG/heart-rate monitors.
Identification & Audio: RFID/NFC readers, sound detection modules, and raw imaging/camera sensors.