ISO 1771:1981

Enclosed-scale general purpose thermometers

The specified requirements deal with a series of inexpensive “commercial” liquid-in-glass thermometers, when great accuracy of measurement is not required. The temperature range covered is from -100 degrees centigrade to +500 degress Centigrade. Temperature scale, immersion, liquid- and gasfilling and the properties of glass are specified. Details of the construction with graduation and marking and expansion volume are described.