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Solenoid Valve 12v 24v 1 4 inch (Blue) 4 Power Indicator Battery Detection Module Sensor Type MQ 2 Semiconductor Gas Sensor Type MQ 2 Semiconductor Gas Sensor (SnO2 based) Detectable Gases H2 ensuring reliable operation of microcontrollers 7 day returns on manufacturing defects only with full refund or replacement at no extra cost and expert support included
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