These bypass indicators form an integral part of an industrial process tank. A pipe is mounted on the side of the tank by means of two process connections. This ensures that the level in the tank corresponds exactly to the level in the pipe. A magnetized float within the pipe activates red/white magnetic rollers, providing a visual indication of fluid level within the tank. Level sensors mounted on the unit will give a 4-20mA output or 0 to 100% output. Magnetic switches will give a high or low alarm.