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With waterproof probe
If one half sees more or less IR radiation than the other
These modules come with flash memory to store the fingerprints and work with any microcontroller or system with TTL serial
Overall Height: 20mm
Hydrogen Sensor Module (MQ8) Neodymium magnet With waterproof probeIntroduction: This is a simple to use hydrogen sensor, suitable for sensing hydrogen concentrations in the air. The MQ 8 can detect hydrogen gas concentrations anywhere from 100 10000ppm. This sensor has a high sensitivity and fast response time. Detects Hydrogen(H2), poorly sensitive to LPG, alcohol, cooking steam, CO. Features : Main chip: LM393 Working voltage: DC5V Load resistance: 10K Dual signal output (TTL level output and Analog output) TTL