1PCS Ozone/ammonia/formaldehyde/hydrogen Sulfide/freon Sensor Module MQ-131/136/137/138/139

High-concerned chemical：None Material：Metal Type：Gas Sensor Output：Digital Sensor Origin：Mainland China Use：Gas Sensor Working current：0.85A working voltage：5V

High-concerned chemical: None Material: Metal Type: Gas Sensor Output: Digital Sensor Origin: Mainland China Use: Gas Sensor Working current: 0.85A working voltage: 5V