A solid state illuminator and display means are provided for bi-coloured ported water level gauges suitable for use in high pressure steam drums or similar watersteam devices to facilitate making an accurate determination of water level in such a device. One embodiment includes an integrated moisture sensor and controller to be placed in soil comprising a controller circuit for controlling a switch; a sensor circuit comprising a probe and adapted to provide the controller circuit a signal corresponding to a moisture level of the soil. The array module provides a controlled, closed environment for the arrays to operate within, as well as a back reflection shield behind the arrays, which yields protection between the array and the array module housing.