* Very simple water level indicator designed to measure water level in a pool or tank by using LEDs to show the water level

*One probe goes into the water and is connected to the 9V positive rail through a 100 ohm resister.

* The other 3 probes connect to the base of each transistor through a 390 ohm resistor.

* When the current flows from the probe to the sense contact connected to the base of the transistor, the LED will turn on.

* The level indicator has 3 inputs, low, medium and high. (yellow, green, red)

* power supply 6-9 V

* box for product FB03

* 9V Battery Snap BS-IR

NOTE: Probes are not included. Probes can be made up of stainless steel screws connected to wires that run back to your circuit board or just wires in contact with the liquid.

WIRE: The insulation should be stripped back 1/2" to expose the conductor, then tin the conductor using appropriate solder.