Diligent Micro Controls offers Flame Monitor for Photo Resistor Type Flame Sensors. Diligent Micro Controls offers Electronic Controllers, Electronic Control Systems & Electronic Control Relays for specific industrial applications. The Flame Monitor for Photo Resistor Type Flame Sensors is also know as Flameye PR. It is a flame monitor that is designed to work with Photo Resistor type flame sensors which respond efficiently to the bright yellow light. Such light is emitted by oil flame and therefore, Diligent Flameye PR is used in most of the oil burners.