Frequently Asked Questions:
Glass Industrial Thermometers

Glass industrial thermometers offer exceptional long-term stability and inherent reading precision. Because they use a fixed expansion principle, they are often relied upon as the local “reference standard” in many facilities, providing a highly reliable visual check against electronic devices.

Yes, our glass industrial thermometers are NIST calibrated and guaranteed accurate to ± one scale division. This ensures the highest level of accuracy and traceability, making them compliant for quality control checks and official process monitoring.

The red liquid fill (often a form of spirit or mercury substitute) contrasts sharply with the white or silver scale backing, significantly enhancing visibility and making the temperature reading much easier to spot from a distance in industrial settings.

Yes. Tel-Tru’s glass industrial thermometers are typically of the adjust-angle type, allowing the user to reposition the viewing head and stem for optimal readability, a crucial feature when installed in confined or elevated spaces.

Due to their design, glass industrial thermometers generally offer finer resolution and higher guaranteed accuracy (± one scale division) than standard bimetal dial units (typically ±1% of span), making them the superior choice for high-accuracy local indication.