Blue Spirit Thermometers

Zeal General Purpose Thermometers are made from the highest quality glass that has been specially selected to have uniform capillary bore and to be free from strain. Instruments are scientifically annealed and artificially aged before testing to ensure stability and maintain accuracy. Top expansion chambers are provided where necessary to allow for overheating. Thermometers with Red, Blue or Green non-fading Spirit are pressured internally.
Each instrument is fitted with an anti roll cap and packed in a protective plastic container.