ISO 4786:1977

Enclosed-scale adjustable-range thermometers

The specified thermomters are used for measuring small temperature differences not exceeding 5 degrees centigrade within the range -21 degrees centigrade to +140 degrees centigrade. They are unsuitable for measuring absolute temperature, and they shall be of the mercury-in-glass encolsed-scale type. Temperature scale, immersion, construction, intervall error and stability are specified. Graduation and dimensions are tabled.