Best Temperature and Humidity Monitors: 10 Reliable Picks for Precise Climate Tracking
Ten climate instruments sorted by what each listing states: WiFi loggers, dew point psychrometers, wireless weather stations and simple mini gauges.
Read Guide→Hygrometers
Temperature, humidity, light, sound, weather and data loggers.
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Buying Guides
Best Digital Hygrometers: 12 Smart Picks for Precise Humidity Tracking
Twelve digital hygrometers compared on connection, stated accuracy, extra readings and pack size, from single units to Wi-Fi sets and Bluetooth loggers.
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Best Humidity Meters: 8 Accurate Picks for Reliable Moisture Monitoring
Ten humidity instruments compared on relative humidity, dew point, wet bulb, logging and form, from a Fluke handheld to psychrometers and loggers.
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How to Use a Psychrometer
Wet bulb, dry bulb, a chart or a calculation. The old method still checks the new sensors.
Read Guide→How to Calculate Dew Point From Temperature and Humidity
The Magnus formula, a worked example, a lookup table and a rule of thumb. Accurate to a fraction of a degree indoors.
Read Guide→How to Measure Relative Humidity Correctly
A checked sensor, settled for 15 minutes, in the right spot, read with the temperature. Otherwise the number is wrong.
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How to Choose a Temperature and Humidity Data Logger
Accuracy, interval, memory, battery, export and an alarm. Match each to the job, from a fridge to a damp wall.
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How to Calibrate a Hygrometer
Saturated salt in a sealed box gives 75 percent RH. One night tells you the error; the meter's offset fixes it.
Read Guide→How to Choose a Humidity Meter for Indoor Use
A capacitive sensor with a stated ±3 percent or better, a dew point readout, and a way to check it against salt.
Read Guide→Product Reviews
Extech MO290 Review: Moisture Psychrometer With Infrared Measurement
A pinless moisture meter with humidity, air temperature and infrared surface readings that calculates dew point and condensation risk on the spot.
Read Review→testo 605i Review: Bluetooth Temperature and Humidity Smart Probe
A Bluetooth thermohygrometer probe with a 90° bendable head for ducts and registers, automatic dew point and wet bulb calculation, and a free phone app.
Read Review→Learning Center
What Is Dew Point and Why Does It Matter Indoors?
The temperature at which the air's moisture condenses. Colder surfaces than this get wet.
Read Article→What Is Relative Humidity?
How full the air is of water vapor, as a percentage of what it could hold at that temperature.
Read Article→Why Humidity Changes Throughout the Day
The water in the air barely changes; the temperature does, and relative humidity follows it.
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