Liquid-in-glass thermometers for machines are economical and rugged. The use of high-quality glass enables the thermometer to maintain a steady measuring accuracy and repeatability. The liquid-in-glass thermometers for machines comprise a rugged protective casing, an indicating capillary and the mounting fitting with rigid connection. The protective casing is made of brass-coloured anodized aluminium or of reasonably-priced gold-coloured plastic for 150 mm lengths . Scale numbering is black. The indicating capillary is backed in white with a wide easy-to-read indicating column filled with blue indicator fluid. The graduation is diffused into the glass and is thus resistant to aggressive service environments. The indicating accuracy is 1 % of full scale value. The capillary is manufactured from PTB approved thermometer glass, N16B or 8409 Supremaxglas. The mounting fittings are delivered according to DIN form B with G 1or 1NPT external thread. The bulbs are made of solid brass up to a maximum immersion length of 63 mm.