Laboratory glass thermometers

A liquid-in-glass thermometer needs no battery, does not drift electronically and, read correctly, gives a stable reference value. It suits baths, incubators and checks on other instruments. A digital thermometer reads faster, can log data and is easier to read, but needs regular checks against a reference. Many labs keep a calibratable glass thermometer as a reference, for example the low-temperature thermometer, enclosed scale, −30 to +50 °C in 0.5 °C, suitable for official calibration. See all laboratory glass thermometers.

On a solid-stem thermometer the scale is etched into a thick glass stem. It is robust and suits rough use and industrial checks, such as the stem thermometer, 0 to +100 °C in 1 °C, red filling. On an enclosed-scale thermometer the scale sits on a separate strip inside an outer glass tube. It reads more easily and allows finer divisions, as on the universal thermometer, enclosed scale, −58 to +5 °C in 0.1 °C, toluene filling. Choose by robustness versus reading comfort. Questions: sales@luminixhealth.com.

Choose a range that puts your working temperature in the middle of the scale, and a division that matches the accuracy you need. Also check the immersion depth: a thermometer is only accurate when it is immersed as specified. Examples: the stem thermometer, −30 to +50 °C in 1 °C, immersion depth 89 mm; the stem thermometer, 0 to +200 °C in 2 °C, immersion depth 89 mm; and the low-temperature thermometer, −50 to +50 °C in 1 °C, for total immersion. Unsure? Ask sales@luminixhealth.com.

Check the filling on each product page. These examples use an organic liquid, not mercury: a red filling, such as on the stem thermometer, 0 to +100 °C, or toluene, such as on the low-temperature thermometer, −50 to +50 °C. Organic fillings are safer if a thermometer breaks, but they are flammable, so clean up broken glass and liquid carefully and ventilate the room. Some organic columns can separate after transport; check the column before use. For other temperature tools, see laboratory glass thermometers.

A liquid-in-glass thermometer is a calibrated column, often with a stated immersion depth, total or partial. The range and the division decide the reading. A partial-immersion thermometer read at the wrong depth is wrong by design.

A thermometer reports a temperature. A liquid-in-glass thermometer is a calibrated column. A digital thermometer is a sensor and a display, and the sensor, not the display, is what is calibrated. An infrared thermometer reads a surface and depends on emissivity. A data logger stores the reading over time. Without a stated uncertainty and a calibration point, the number is only an indication. The scale is maintained by the BIPM and compared by EURAMET. Accreditation is BELAC.

This shelf belongs to Temperature measurement, inside Lab instruments. Luminix Health distributes this range for laboratory use.

The neighbouring shelves are Temperature probes & sensors, Hygrometers & humidity meters, Data loggers, Temperature measurement accessories, Digital thermometers and Infrared thermometers. The category above this shelf is Temperature measurement.

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