Under $100

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fischertechnik Mini switch (button/ touch sensor)

Sensor

37783

The fischertechnik touch sensor

HK$ 52.00
fischertechnik Photo transistor assembled

Sensor

36134

Electronic switch that reacts to light

HK$ 38.30
Grove - Humidity and Temperature Sensor

Sensor

101020011

Grove - Temperature & Humidity Sensor is a...

HK$ 65.00
Kitronik 'Mini' Prong Soil Moisture Sensor for BBC micro:bit

Sensor

56107

The Mini Prong soil sensor is a short...

HK$ 21.00
Light barriers LED 9V assambled 0.01A

Sensor

162135

A light-emitting diode is a semiconductor element that...

HK$ 38.30
SparkFun Soil Moisture Sensor (with Screw Terminals)

Sensor

SEN-13637

The SparkFun Soil Moisture Sensor is a simple...

HK$ 60.00
Temperature Sensor - Waterproof (DS18B20)

Sensor

SEN-11050

This sealed digital temperature probe lets you precisely...

HK$ 86.00