ModBus RS485 Air Atmospheric Pressure Sensor Sale! from 7900 /per Qty. Add to Cart This item is currently on backorder but you can still purchase it now and we'll ship as soon as more become available. This RS485 IOT Sensor is an Air Atmospheric Pressure Sensor with detection range 0-120kpa. SKU:IOT-S300AP SKU: IOT-S300AP Tweet