The invention relates to a tube gauge (10) for clamping a tube (78) which is to be widened with a tube flanging tool (80) and which comprises a base (20) and a height gauge (30). The base (20) has a plurality of gripping holes (26), each of these gripping holes (26) being formed with a round hole (27) and an expanding hole (28). The height gauge (30) having a plurality of stop members (32) is movably attached to the base (20) such that the stop members (32) are mounted on the first surface (22) and parallel to the first surface (22). The height gauge (30) is brought into a position in which the stopper members (32) over the widening holes (28) or around the in the gripping hole (26) clamped tube (78) to be widened with the Rohrbördelungswerkzeug arranged are and push on this.
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