The Plastic Bypass Level Indicators Model NBK-15, NBK-16, NBK-1 are especially designed to provide an extremely high quality performance for very specific purposes. It is also basically designed to meet the requirements and standards of the users and operators in need of such high quality apparatuses. The level indicators are mainly used for a continuous measurement, display and monitoring of several liquid levels. The bypass tube built on the indicators are located at the sides of the vessels which follow the liquid levels considered to be a non-contacting way for a display.