SparkFun Electronics

You have added to your comparison list. Compare Items Clear the listYou have added to your comparison list.Measure indoor air quality with confidence.Directly measure CO₂ while monitoring temperature and humidity, with environmental compensation and easy Qwiic connectivity.SFA40 Formaldehyde SensorAccurate formaldehyde sensing for indoor air quality projects.Measure HCHO from 0–2000 ppb with low cross-sensitivity, built-in environmental compensation, and easy Qwiic I²C integration.SparkFun Non-Invasive Current SensorMeasure AC current without breaking the circuit.Pair the Qwiic-enabled ADE7953 current sensor with a 100A split-core current transformer for accurate, non-invasive current monitoring.More speed and power than you ever thought possible in a microcontroller.Automatically detects Qwiic sensors and starts logging data instantly—locally or to the cloud.Our Latest & Greatest ProductsSparkFun CO2 Sensor - STCC4/SHT40 (Qwiic) $30.95 As low as $26.31 In stock Compare Add ...