Under $100
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fischertechnik Mini switch (button/ touch sensor)
Sensor
37783The fischertechnik touch sensor
HK$ 52.00
fischertechnik Photo transistor assembled
Sensor
36134Electronic switch that reacts to light
HK$ 38.30
Grove - Humidity and Temperature Sensor
Sensor
101020011Grove - Temperature & Humidity Sensor is a...
HK$ 65.00
Kitronik 'Mini' Prong Soil Moisture Sensor for BBC micro:bit
Sensor
56107The Mini Prong soil sensor is a short...
HK$ 21.00
Light barriers LED 9V assambled 0.01A
Sensor
162135A light-emitting diode is a semiconductor element that...
HK$ 38.30
SparkFun Soil Moisture Sensor (with Screw Terminals)
Sensor
SEN-13637The SparkFun Soil Moisture Sensor is a simple...
HK$ 60.00