Thermometer, Digital, Indoor-Outdoor

Quick Answer: The Thermometer, Digital, Indoor-Outdoor is an electronic thermometer that displays two temperatures at once: the air around the display unit and a second point reached by a remote sensor, usually on a thin cable. A digital indoor-outdoor thermometer lets you watch conditions inside a cabinet, room or greenhouse and outside it without moving.

Two Places, One Display

The display unit carries its own sensor, labelled indoor or in. The second sensor sits at the end of a lead that can be passed through a window gap, a door seal or a cable port. With that arrangement, the reading from a fridge, incubator, cold box or outside wall can be seen without opening anything, so checking does not disturb the conditions being measured.

If the remote sensor is measuring outside air, put it in shade and away from walls that store heat; direct sun on the sensor gives readings far above air temperature. Inside equipment, fix it near the items being protected rather than against the cold plate or the heater. Many units of this kind also remember the highest and lowest values since they were last reset, and some add humidity; neither feature is stated in this title.

For humidity as well as two temperatures, see the digital thermo-hygrometer with in-out thermometer. For a single-point room reading with RH, the digital thermo-hygrometer is simpler.

Specifications

Applications

• Watching the temperature inside a fridge, incubator or cold box from outside
• Comparing greenhouse or polyhouse air with outside air in biology projects
• School weather corners that show indoor and outdoor temperature side by side
• Testing how well an insulated box keeps samples cool during a field trip

Care & Handling

• Route the sensor lead so doors cannot crush it; the flattest part of a gasket is the gentlest path.
• Keep the display unit dry; only the remote sensor is meant for colder or damper places.
• Replace the batteries at the first sign of a faint display.
• Before relying on the readings, leave both sensors side by side for a while and note any difference between them.

Why Choose LabEquip

Nurseries, schools, cold-chain users and biology labs buy two-point thermometers to monitor an enclosed space without opening it. LabEquip lists this model in General Lab Products; ask for the lead length through the contact page.

Frequently Asked Questions

Why is the outdoor reading far too high in the afternoon?

The remote sensor is probably in sunshine or near a warm wall. Move it to a shaded, ventilated place, ideally under a small shelter, so it measures air rather than sunlight.

Can the remote sensor go inside a freezer?

It can if the model’s range reaches freezer temperatures and the lead can pass the door seal without being crushed. Look at the lower limit of the outdoor channel first.

Is the remote sensor waterproof?

Many remote sensors tolerate damp and cold, but not all can be submerged. Unless waterproofing is confirmed, keep the sensor out of standing water and away from direct rain.

Can I extend the sensor cable?

Extending it is not recommended, because joints and extra length can change or interrupt the signal. Choose a model whose lead is long enough for your installation.

Why do the two readings differ when both sensors are side by side?

Small differences come from sensor tolerances and from the display unit’s own warmth. Note the difference and allow for it, or keep the display away from heat sources.

How is it different from a glass maximum and minimum thermometer?

A glass maximum and minimum thermometer records extremes at one place without batteries. The digital indoor-outdoor type shows two places at once and is easier to read, but it needs power.

Last Updated: September 2026