Determine relative humidity within ±1.5% accuracy and temperature within ±0.8° F accuracy. This meter comes with a calibration certificate traceable to NIST that states it has passed a test for accuracy. It also displays dew point or frost point.

For comprehensive system checks and quality control, these meters measure a wider relative humidity range than pocket meters and can determine dew point in addition to humidity and temperature.

To ensure reliable readings on the go, this portable meter comes with a calibration certificate traceable to NIST that states it has passed a test for accuracy.

The probe is attached to a 3-ft. cable for checking humidity, temperature, and dew point in hard-to-reach areas.

Also known as sling psychrometers, these calculate relative humidity in the field based on continuous temperature measurements from a wet-bulb and a dry-bulb thermometer. They consist of two mercury-free fluid-filled thermometers, a wick, a glass water bulb, and a handle.

Psychrometer with ±5% relative humidity accuracy has a built-in slide rule for calculating humidity without a calculation table.

Obtain continuous temperature measurements from a wet-bulb and a dry-bulb thermometer to determine relative humidity. This wall-mount psychrometer consists of two mercury-free fluid-filled thermometers, a wick, a glass water bulb, and a relative humidity calculation table.

Remotely record temperature, humidity, and dew point up to 10 feet from the display and set the alarm to sound and flash the display if temperature readings rise above or fall below a set range. This recorder has a remote probe on a 10-ft. cable and a display that can be set to show current temperature, minimum/maximum temperature, or relative humidity and calculated dew point. Charts (not included) are required; select a recording time and temperature range from the available chart options.

Track ambient temperature and humidity over time with this recorder that includes a calibration certificate traceable to NIST that states it has passed a test for accuracy. Charts (not included) are required; select a recording time and temperature range from the available chart options.

No cords or software required—this data recorder stores readings on an included SD card in Excel format for easy transfer to a PC.

The USB connection lets you upload up to 32,000 data points to a PC for analysis. These recorders require software and a USB cord (not included).

The sensor monitors relative humidity and triggers the controller to turn equipment on or off. Sensor and controller are sold separately.

Controller is single pole, double throw (SPDT). It can be set to turn one circuit from off to on (normally open) or from on to off (normally closed). Set the actuation point with the keypad.

Reduce the humidity in your enclosure to prevent condensation that can cause corrosion and short circuits. These humidistats switch your heater on when the enclosure reaches the relative humidity setting. Once the humidity falls by 5%, the heater switches off. To install, clip humidistats to a DIN rail.

Nonadjustable humidistats work for most applications. They keep humidity below 65%, which is when condensation is most likely to form. Since they aren’t adjustable, the humidity setting can’t be tampered with or accidentally changed. For critical components, use adjustable humidistats to set the relative humidity you need in your enclosure. Use a lower humidity setting in damp environments and places with frequent temperature changes. Condensation is more likely in these situations.

UL recognized, C-UL recognized, CE marked, and VDE certified, these humidistats meet American, Canadian, and European safety standards. They also meet UL 94V0, so if they catch fire, they self-extinguish within 10 seconds and won’t spread the fire by dripping.

When long life with little maintenance is critical, rely on the same rugged weather equipment used by the National Weather Service. For a complete weather station, you'll need at least one sensor, a sensor cable, and either the Weather Data Center Display or one of the Real-Time Displays.

All mount on vertical 1" pipe (1 3/8" OD). Mounting hardware is included; pipe is not included. Connect to power using screw terminals.

(A) Temperature/Relative Humidity Sensor—Includes a shield that maintains accurate temperature readings by reducing sensor exposure to solar radiation and precipitation. Operates on 10-28 VDC. Output is 4-20 mA.

(B) Barometric Pressure Sensor—Operates on 7-30 VDC. Output is 4-20 mA. Enclosure (sold separately) is required. Optional wind screen reduces variance in measurements caused by wind gusts.

(C) Wind Speed/Wind Direction Sensor—Operates on 8-15 VDC. Output is pulse for wind speed and analog voltage for wind direction. Optional line driver converts the output into 4-20 mA for use with standard PLCs (programmable logic controllers).

(D) Rainfall Intensity Sensor—Does not require a power supply. Output is pulse.

Weather Data Center Display (For Sensors A-D)—Presents live readings from up to eight sensors and logs more than two million readings for later upload to your PC using an RS-232 serial communication cable (sold separately). It can also be programmed to activate alarms on up to four readings. Resolution is 0.1° F for temperature, 1% for relative humidity, 0.01" Hg for barometric pressure, 1 mph for wind speed, 1° for wind direction, and 0.01" for rainfall. Display operates on 10-30 VDC or the included 115 VAC adapter with 6-ft. power cord and two-prong plug. Overall size is 5 11/16" Ht. × 7 7/8" Wd. × 2 1/8" Dp.

Real-Time Displays (For Sensors A and C)—Get accurate, real-time data from either the temperature/relative humidity sensor or wind speed/wind direction sensor. Alarms activate when your chosen thresholds are reached. Resolution is 0.1° F for temperature, 1% for relative humidity, 1 mph for wind speed, and 10° for wind direction. Displays can be linked in parallel to feed multiple displays from a single sensor. They operate on 12-30 VDC or the included 110 VAC adapter with 6-ft. power cord and two-prong plug. Overall size is 5 11/16" Ht. × 5 11/16" Wd. × 1 7/16" Dp.

Check temperature, relative humidity, atmospheric pressure, and time with one barometer. The included remote sensor has a 200-ft. wireless transmission range for monitoring outdoor temperature and relative humidity in addition to indoor conditions.

Monitor nine different weather conditions up to 1,000 feet away. The outdoor weather sensor measures outdoor temperature, humidity, wind speed and direction, rainfall rate, total rainfall, barometric pressure, heat index, wind chill, and dew point. It wirelessly transmits readings to the console by radio signal. Console has built-in sensors to measure indoor temperature and humidity. Console can be placed on a desk or mounted to a wall.

Measure atmospheric pressure changes in both inches of mercury (Hg) and millibars (mbar).

Take field measurements of temperature, dew point, heat index, wind chill, wind speed, and relative humidity.

Keep an eye on leaks, overflow, and temperature changes near your equipment, even when you’re offsite. These detectors connect to your Wi-Fi to send alerts about moisture, temperature, and humidity to your smartphone or tablet. Place them near tanks and tubs to watch for overflow, or near sump pumps and pipe lines to monitor temperatures and prevent frozen pipes. When water touches one of the sensors on the detector, a buzzer also goes off, alerting anyone nearby. Rated IP44, these detectors are protected from objects larger than 1mm, such as wires, and from water splashing in any direction.

Download an app onto your smart device to program temperature and humidity ranges and set up alerts. You can also create reports that show changes in temperature and humidity over time.

To extend the area they monitor, these detectors come with a detachable cable sensor that senses moisture along its entire surface. Swap in replacement cable sensors for worn sensors, or link several together to wrap around large equipment or trace the path of a pipe. Extend them up to 500 feet from detectors.

Measure temperature, humidity, and radiant heat in your work area to keep your team safe from heat-related hazards. These monitors help you avoid dangerous conditions and comply with OSHA standards for a safe work environment. They use a variety of measurements from your surroundings to calculate the heat stress index and the wet bulb globe temperature (WBGT), which tell you how hot it feels. Set a maximum wet bulb globe temperature, and an alarm will go off when heat reaches the safety limit.

These monitors have two sensors. One measures temperature, humidity, dew point, and wet globe temperature. The other measures black globe temperature, which is the effect of direct solar radiation on an exposed surface. Carry monitors with you to measure different areas, or mount to your tripod to measure conditions over time.

To maintain their accuracy, monitors should be calibrated once a year. You can calibrate the monitor yourself using humidity standards. These standards contain a known humidity, so you can adjust your monitor until it reads the humidity correctly.

Monitors that come with a calibration certificate traceable to NIST have passed a test for accuracy.

Power these monitors with the included batteries, or add a power adapter to plug them in.

Add a memory card to store your readings and export them to a computer.

Turn the dial to control humidity equipment.

Humidistats for humidifiers and dehumidifiers mount to a surface-mount outlet box.