The Stevens SDX (Submersible Depth Transmitter) is a pressure sensor that delivers accurate results. High impact, corrosion-resistant PVC Type II housing and potted electronics make the SDX extremely durable for most water and hostile fluid environments. The SDX comes equipped with user specified vented cable lengths. The vent provides an atmospheric reference for the sensor, which is necessary for ensuring the highest possible accuracy when making a level measurement. The SDX features one 4-20 mA analogue output signal that corresponds linearly to range, accuracy of ± 0.25% full span.