ISO 1770:1981

The specified requirements deal with two series of inexpensive "commercial" liquid-in-glass thermometers, when great accuracy of measurement is not requirend: a series designated A to H, in which nominal ranges and maximum overall lengths are specified and a series designated J to W of greater accuracy and with specifies ranges and overall length, which may be acceptable for testing by a national verification laboratory. Temperature, scale, immersion, liquid- and gasfilling and details of the construction are specified.