With Spartanburg, S.C.-based Bindicator’s patented external LED lights, one is able to see the alarm and functional status of the level sensor. The company’s Roto-Bin-Dicator, Pulse Point and RF Series level sensors offer models with two, externally visible LED lights with external functional test. The green LED indicates power and operation status. The red LED indicates alarm and failure status. By placing the company’s magnetic fob over the LEDs, the unit can easily be tested while in operation.