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 ModuleMQ-7 Carbon Monoxide Gas Sensor Module RM7.90 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.