Rotameter glass pipes are most commonly used measuring instruments for measuring flow, and are used in the laboratory, and often in the manufacturing industry. The over-representation is the consequence of the simplicity of the measuring device, the wide applicability with respect to the possibility to measure the flow of gases and liquids. The measurement is based on correlation of the pressure drop resulting from flowing through the constriction, and the flow of liquid or gas. Rotameter glass tube has a variable diameter, closest intersection at the entrance to the pipe, and the widest output. We make them in standard as well as special sizes according to the customer‘s request.