10pcs Light Dependent Resistor Photoresistor LDR 5MM GL5506 5516 5528 5537 5539 5547 5549 Photoconductive Resistance SensorCNY 4.42-12.65/piece MQ-135 MQ-2 MQ-3 MQ-4 MQ-5 MQ-6 MQ-7 MQ-8 MQ-9 Detection Smoke Methane Liquefied Gas Sensor Module for Arduino Starter DIY KitCNY 7.72-8.84/pi...