Specification Thermometers

I.P. Thermometers is British Standard . These Thermometers are made in accordance with the specifications of the INSTITUTE OF PETROLEUM (I.P.).  The Filling is mercury (Hg) except for scales below -38°C.

I.P. equivalent similar thermometers blue spirit filling These thermometers possess the same characteristics as IP thermometers, except for the filling liquid, which is a non toxic blue spirit (LB), and the length in some cases. 

U.S.A standardized thermometers

A.S.T.M is an American These thermometers are manufactured according to the specifications of
the American Society For Testing And Material (ASTM) standard The colour of the glass of these thermometers is standardized in yellow,
giving a much better reading than the white back. Delivered with a hook/
ring. The filling liquid is mercury for the ASTM , except for the scales belox -38°C, and the blue spirit 

Blue, Special Red, Gallium and Toluene filled IP & ASTM Thermometers