Capillary tube in solid glass, bar-shaped, prismatic (optical enlargement of the column, except for high temperature types), diameter approx. 6 to 8 mm (depending on version), oval opening, with yellow background for mercury * and white background for blue fluid column. The scale is deeply burnt in black, which gives it absolute resistance. The main graduations, which correspond to the impression on the case, are particularly well defined.
Please note: The required order specification is written on the back of the insert. Replacement glass inserts include the required mounting hardware.
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