RGB Color Sensor (with IR filter and White LED) TCS34725 1302 MQ-2 Gas Sensor module is

MQ-2 Gas Sensor module is useful for gas leakage detecting in home and industry

It will return a higher value around 5

Current Sensor (AC - 100A)( SCT-013)

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RGB Color Sensor (with IR filter and White LED) TCS34725 1302 MQ-2 Gas Sensor module isIntroduction: The best color sensor on the market, the TCS34725, which has RGB and Clear light sensing elements. An IR blocking filter, integrated on chip and localized to the color sensing photodiodes, minimizes the IR spectral component of the incoming light and allows color measurements to be made accurately. The filter means you'll get much truer color than most sensors, since humans don't see IR. The sensor also has an incredible 3,800,000: 1