Thermometer, Digital, Multi Stem

Quick Answer: The Thermometer, Digital, Multi Stem is a battery-powered probe thermometer with a pointed metal stem that is inserted into the material being measured, the temperature showing on a small digital display. A digital multi stem thermometer is a general-purpose tool for liquids, agar, soil, food and other semi-solids where a glass thermometer could break.

One Probe for Many Materials

The title’s ‘multi stem’ is not defined further. In catalogue use it usually means a general-purpose stem probe for many materials, so interchangeable probes should not be assumed unless confirmed. The sensor sits near the tip of a metal stem, which means only the last few centimetres need to be immersed. The pointed end pushes into soft solids such as dough, compost or set gelatin, which a glass bulb would not survive.

The probe format suits food technology and microbiology preparation: checking that molten agar has cooled enough to add heat-sensitive supplements or to pour plates, or that a cooked sample has reached its target core temperature. In chemistry it serves for water baths and warm aqueous solutions, but strong acids, alkalis and organic solvents can attack metal stems and seals and are better measured with glass.

Wipe the stem after each reading and disinfect it between food or culture samples. Keep the display head out of steam and water. For carrying on rounds, the smaller digital pocket thermometer is handier; for readings without contact, use the digital infra-red thermometer.

Specifications

Applications

• Checking molten agar has cooled enough before adding supplements and pouring plates
• Core-temperature checks in food technology and home science practicals
• Measuring compost, potting mix and soil temperatures in horticulture classes
• Routine water-bath and warm-solution readings where a glass thermometer might break

Care & Handling

• Clean and disinfect the probe after each sample, especially between raw and cooked food or between cultures.
• Immerse only the stem; the display head is not waterproof unless stated.
• Push the tip gently into firm materials, since a bent stem can damage the sensor wiring.
• Test it in ice water occasionally, and replace the battery when the display dims.

Why Choose LabEquip

Home science, food technology and microbiology teaching labs, as well as canteens, buy this thermometer for everyday checks. LabEquip lists this model in General Lab Products; ask about stem length and range through the contact page.

Frequently Asked Questions

How deep should the probe go into a liquid?

Deep enough to cover the sensing zone near the tip, usually a few centimetres, and clear of the container’s walls and bottom. Stir gently and wait for the reading to stop changing.

Can it be used in acids or organic solvents?

Not safely. Metal stems can be corroded by acids and alkalis, and solvents may attack seals. Use a glass laboratory thermometer for these liquids.

How do I check that the reading is correct?

Put the stem in a stirred slurry of crushed ice and water; it should read close to 0 °C. Some models have a calibration adjustment; others should be replaced if they read well off.

Is it suitable for culture media?

Yes, provided the probe is cleaned and disinfected before and after use so it does not contaminate the medium. Many labs keep one thermometer only for media preparation.

Why does the reading take longer in thick materials?

Heat moves slowly through dough, compost or agar, so the stem takes time to reach the material’s temperature. Wait until the display is steady, and measure at the centre for a core reading.

Can the thermometer be left in an oven?

No. The display and battery are not built for oven heat. Take readings by inserting the probe briefly, or use a thermometer with a heat-resistant lead for continuous oven monitoring.

Last Updated: September 2026