Sort by popularity Sort by average rating Sort by latest Sort by price: low to high Sort by price: high to low View: 12 24 All Add to Wishlist Add to Wishlist Add to cart Add to Wishlist Add to Wishlist Sensor Module, StarterMQ-2 Smoke Gas Sensor Module RM6.50 This is a sensor module you can use with Arduino to measure the amount of contaminant in surrounding air, providing air quality reading for your projects.