Dew Point Meters for Industrial Coating: 5 Picks Compared
A comparison of five dew point meters for coating work, with the surface temperature margin explained and the limits of each instrument stated.
Read Guide→Environmental Monitoring
Temperature, humidity, light, sound, weather and data loggers.
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Buying Guides
Best Psychrometers for HVAC Humidity Measurement: 7 Picks
A comparison of seven psychrometers for HVAC humidity measurement, covering digital meters that calculate wet bulb and dew point and two sling psychrometers that derive them from wet and dry bulb temperatures.
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Best Soil Thermometers for Gardening: 7 Picks for Germination, Beds and Compost
A comparison of seven soil and compost thermometers, covering stem depth, temperature range, dial readability and which jobs each one actually fits.
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Best Soil Moisture Meters for Landscape Irrigation: 6 Picks
Six soil moisture meters for landscape irrigation compared on probe depth, reading type, and suitability for scheduling.
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Best Ultrasonic Anemometers for Weather Monitoring: 7 Picks
Six ultrasonic anemometers for weather monitoring, compared on sensor type, output, mounting, and what the listing does and does not state.
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The Best Barometers for Weather Monitoring: 7 Picks
Seven barometers for weather monitoring compared on trend display, pressure resolution, altitude correction and whether they log.
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Best Weather Stations for Construction Sites: 6 Picks
A comparison of six instruments for monitoring wind on construction sites, covering crane anemometers, alarm units, handheld meters and full weather stations.
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Best Weather Stations for Small Farms: 5 Picks for Frost, Spray and ET
A comparison of five weather stations suited to small farm use, covering frost alerts, spray window data, rainfall accuracy and remote access.
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Best Wireless Hygrometers for Multiple Rooms: 6 Picks
A comparison of five wireless hygrometer systems for multi-room humidity mapping, judged on sensor count, stated transmission range, and display versus app access.
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Best Hygrometers for Camera and Lens Storage: 7 Picks
Seven dry cabinets with built-in hygrometers, compared on control range, stated accuracy, capacity, and what each listing does not publish.
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Best Hygrometers for Instrument Cases: 7 Picks for Acoustic and Electric Storage
A comparison of seven hygrometers and humidity control systems for acoustic and electric instrument storage, covering case-sized meters, soundhole gauges and two-way humidification packs.
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Best Hygrometers for Wine Cellars: 6 Picks
Six hygrometers that genuinely suit a wine cellar, ranked by how well they hold a stable, checkable humidity reading.
Read Guide→Product Reviews
Newentor Weather Station Review: Three Sensor Channels and a Barometer
A wireless indoor and outdoor weather station stating a colour LCD with indoor and outdoor temperature and humidity, daily high and low, alerts, forecast, moon phase and barometric pressure, with support for three remote sensors.
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Testo 405i Review: A Hot Wire Probe That Reaches Inside the Duct
A hot wire anemometer stating air velocity, temperature and in-duct airflow with volume flow calculated from entered duct dimensions, on a hinged telescopic shaft extending to 15 inches, operated by Bluetooth app.
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Extech RH300 Review: Dew Point and Wet Bulb Without Slinging Anything
A digital psychrometer displaying relative humidity, temperature and dew point or wet bulb or probe temperature simultaneously, replacing a sling psychrometer.
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Elitech RC-51H Review: 32,000 Points and a PDF With No Software
A reusable pen-shaped USB temperature data logger stating 32,000 recording points, PDF export without software, IP65 protection with the cap fitted and compliance with FDA 21 CFR Part 11.
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Temp Stick Review: WiFi Temperature and Humidity Alerts Without a Subscription
A WiFi temperature and humidity sensor stating no subscription, unlimited text, app and email alerts, monitoring every second and one to two years on two AA cells.
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TopTes TS-501B Review: A 30 to 130 dB Meter With A and C Weighting
A handheld sound level meter stating 30 to 130 dB with 1.5 dB accuracy, a 30 to 8000 Hz frequency response, A and C weighting, a condenser microphone, max and min and data hold.
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TopTes TS-301 Review: An Anemometer With Humidity and a Big Screen
A vane anemometer stating six speed units, a 2.26 inch backlit LCD, humidity from 0 to 99.9 percent and temperature from -4 to 140 F, with a stated 30 minute sensor acclimatisation.
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BTMETER BT-100 Review: A Vane Anemometer That Publishes Its Starting Speed
A handheld vane anemometer stating 0.67 to 67.1 mph at 2 percent of reading, 0.1 m per second resolution, eight vanes, two temperature sensors, five units, wind chill and a tripod thread.
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TempPro TP50 Review: A Room Hygrometer That Publishes Its Accuracy
A digital thermometer and hygrometer stating 2 to 3 percent relative humidity accuracy, 1 F temperature accuracy, a 10 second refresh, high and low records and a dry, comfort or wet indicator.
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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.
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Extech LT45 Review: LED Light Meter for Modern Lighting
A lux and foot-candle meter with a range to 400,000 lux and settings for coloured LED sources; the Amazon listing bullets describe a different product.
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Extech LT300 Review: Handheld Light Meter for General Measurement
A lux and foot-candle meter reading to 40,000 lux with a remote cosine- and colour-corrected sensor, backlit LCD, min/max, data hold and relative mode.
Read Review→Learning Center
What Is a Lux Meter and When Is It Useful?
Measures how much light lands on a surface. Useful for workplaces, plants, photography and checking a "bright" room.
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What Does dBA Mean on a Sound Meter?
Decibels filtered to match human hearing. It is the unit almost every noise limit uses.
Read Article→What Is a Sound Level Meter?
A microphone, a weighting filter and a decibel display, built to a standard so readings can be compared.
Read Article→Vane vs Hot-Wire Anemometers: What Is the Difference?
Vanes for grilles and wind; hot-wires for low speeds and small holes. Each has a blind spot.
Read Article→What Is an Anemometer and What Does It Measure?
Air speed, and from it airflow: the number behind vents, fans, fume hoods and weather.
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Why Professional and Consumer Sensors Can Give Different Results
Same physics, different corrections, references and housings. The gap is usually explainable.
Read Article→Calibration vs Adjustment: What Is the Difference?
Calibration finds out how wrong an instrument is. Adjustment changes it. They are separate steps.
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What Is Repeatability in a Measuring Instrument?
Measure the same thing twice and get the same answer. Repeatability is how close the two are.
Read Article→What Is Measurement Uncertainty?
The honest range around a reading. Every measurement has one, whether or not the display admits it.
Read Article→Why Temperature Sensors Need Time to Stabilize
A sensor has mass. It has to reach the temperature of the air before it can report it.
Read Article→Why Sensor Placement Can Change Your Measurements
A sensor measures the air touching it. Where that air came from decides what the number means.
Read Article→How Often Should Environmental Sensors Record Data?
Fast enough to catch the event you care about, slow enough to last. Usually 1 to 15 minutes.
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