I have a bias circuit that I want to put indicators on. The bias would be set for .7vdc +/-50mv and I'd like to have a green indicator on when it is within range. Also, and more importantly, I need to have a red indicator when the difference between two bias points is out of balance by more than 10mv. I have a readily available 8v supply and could provide a different voltage if required. If not to much added complexity, the setpoint/hysteresis for the bias should be variable.