To provide a scale which makes it possible to adjust the temperature of a furnace so that a ceramic blank can be properly heated even if various conditions such as the combination of the used ceramic blank and investment, and the type and size of the furnace vary, the scale comprises: a scale part; and a base part, the scale part and the base part being formed of wax or resin, wherein the base part has a shape of protruding from part of the scale part, a size of the scale part is larger than that of the base part in a direction orthogonal to a protruding direction of the base part.

A multi-stage temperature indicating device having a first elongate housing and an indicator assembly, the indicator assembly being slidably positioned in a first bore of the first elongate housing and having a middle indicator stem and an inner indicator stem. The multi-stage temperature indicating device also has a means for urging an inner indicator stem, to a second set stroke, out of the middle indicator stem, and for sliding the middle indicator stem, to a first set stroke, out of the first elongate housing.

A multi-stage temperature indicating device having a first elongate housing and an indicator assembly, the indicator assembly being slidably positioned in a first bore of the first elongate housing and having a middle indicator stem and an inner indicator stem. The multi-stage temperature indicating device also has a means for urging an inner indicator stem, to a second set stroke, out of the middle indicator stem, and for sliding the middle indicator stem, to a first set stroke, out of the first elongate housing.