AEDIKO 2pcs Relay Module DC 5V 4 Channel Relay Board Shield with Optocoupler Isolation Suport High/Low Level Trigger 4 Channel 5V auspowers_batchfour HVAC/R refrigeration air- conditioning industry June_2023_update

AEDIKO 2pcs Relay Module DC 5V 4 Channel Relay Board Shield with Optocoupler Isolation Suport High Low Level Trigger 4 Channel 5V auspowers_batchfour HVAC R refrigeration air conditioning industry June_2023_update HVAC R refrigeration air conditioning industry used to measure the pressure differenceMedical facilitiesMeasure negative pressure setting to ensure indoor air pests will not pollute the air in the outside worldMeasure the positive pressureComputer peripheral equipment pneumatic control Technical Specifiations Pressure Range: ±2psiAccuracy: ±0 you can calibrate the display value of current voltage by yourself Trigger Current of Opto Isolator: 5mA Maximum Load: AC 250V 10A