Digital Thermo-Hygrometers, IN-OUT Thermometer

Quick Answer: The Digital Thermo-Hygrometers, IN-OUT Thermometer is an electronic instrument that shows indoor temperature and relative humidity together with a second, outside temperature, so conditions in two places can be read from one display. Instruments of this kind usually take the outside reading from a probe on a thin cable; the probe length and ranges are confirmed on request.

Two Places on One Display

The IN reading comes from sensors in the main unit and covers the room it sits in. The OUT reading comes from a separate sensor that can be placed elsewhere: outside a window, inside a greenhouse, in a refrigerator, or in a water tank if the probe is sealed for immersion. On most indoor-outdoor thermo-hygrometer designs the outside channel reads temperature only, while humidity is measured indoors; mention it when ordering if an outdoor humidity reading is important.

Having both numbers side by side makes comparisons easy for students. A class can record the indoor and outdoor temperatures every morning for a term and plot them, see how well the building holds heat on a cold night, or compare a greenhouse with the air outside. In a laboratory, the OUT sensor can sit inside an incubator, cold room or storage cabinet while the display stays on the bench.

For honest outdoor readings, keep the sensor in shade and shelter, ideally inside a louvred screen, because a sensor in sunshine reads the sun’s heating rather than the air. Run the cable through a window seal or a small hole without crushing it.

Applications

• Daily records of indoor and outdoor temperature for school weather studies
• Comparing a greenhouse or polytunnel with the air outside
• Watching an incubator, cold room or cabinet from outside without opening it
• Studying how well a classroom holds heat overnight

Care & Handling

• Shade the outdoor sensor from direct sun and rain, ideally in a louvred screen.
• Route the cable so it is not pinched by a closing window or door.
• Label which channel is IN and which is OUT when several units are used.
• Keep the indoor unit away from radiators and sunny windowsills.

Specifications

Why Choose LabEquip

Schools running weather records, horticulture departments and labs keeping an eye on remote cabinets find a two-channel display saves walking between sites. LabEquip lists this model in its General Lab Products range, with the temperature-only digital indoor-outdoor thermometer for users who do not need humidity; contact us with the cable length you require.

Frequently Asked Questions

Does the outdoor sensor measure humidity?

On most instruments of this type the outdoor channel measures temperature only and humidity is read indoors. If you need outdoor humidity as well, mention it when ordering so a suitable model can be confirmed.

Where should the outdoor sensor go?

In shade, sheltered from rain and away from walls that warm in the sun, ideally inside a louvred screen. A sensor in sunshine shows the sun’s heating, not the air temperature.

Can the OUT sensor be placed inside a refrigerator?

Yes, if its range reaches low enough. Pass the thin cable through the door seal so the display can be read outside without opening the door.

Can the sensor go in water?

Only if it is sealed for immersion. Ask whether the sensor is waterproof before using it in a tank, aquarium or water bath.

How can students use the instrument in a science project?

Record indoor and outdoor readings at the same time each day for several weeks, then plot both lines. The gap between them shows how heating, insulation and sunlight affect the indoor climate.

Why does the indoor reading change when I move the unit?

Sensors in the main unit read the air around them, so a spot near a heater, window or doorway gives different values. Keep the unit in one representative place for consistent records.

Last Updated: September 2026