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Monitor your indoor air quality with an inexpensive CO2 sensor. We look at three candidates to help you find the best solution. ... Three inexpensive CO2 sensors compared ... inexpensive solutions: the Winsen MH-Z19C [1], the ScioSense ENS160 [2], and the Sensirion SCD40 [3]. The latter sensor from brand manufacturers such as Adafruit, Pimoroni, or SparkFun are really expensive

,000. I negotiated a deal with Ingres that reduced the charge for the database engine to $840 on a server and $10 on a workstation. It was so inexpensive that DEC did not raise the price of the Ultrix