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.

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.

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.

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

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.

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.

Mount these meters through the wall of a sealed container or package to monitor relative humidity, temperature, and dew points without exposing the contents to dust and water. Check the readings on an easy-to-read LED display. Made of aluminum, the housing is lightweight and resists corrosion.

For technical drawings and 3-D models, click on a part number.

Use smartphones and tablets to monitor humidity and temperature within your system or facility. Connect these battery-powered transmitters to your smart device via Bluetooth, and receive data to ensure workplace conditions are suitable for processes, inventory, or personnel. Good for preventative maintenance and route-based monitoring, these transmitters let you choose how frequently you receive the data, and they’ll notify your device when humidity and temperature levels go outside of your thresholds. Download the app, set your parameters, and collect data from up to 300 ft. away. Rated IP65, they are protected against dust and washdowns.

Turn your transmitter into a portable monitoring system by attaching a quick coupling (not included). This allows fast, temporary connections for on-the-go measurements in different locations.

For technical drawings and 3-D models, click on a part number.

No cords or software required—these data recorders store readings on an included SD card in Excel format for easy transfer to a PC.

Data recorders with a NIST certificate of calibration include a calibration certificate traceable to NIST that states the recorder has passed a test for accuracy.

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. Recorders come with a replaceable sensor, so no probe is needed. Charts (not included) are required; select a recording time and temperature range from the available chart options.

Monitor humidity in sealed containers without opening them, protecting the inside from contamination. These plugs are often used on plastic bags, storage containers, and electrical housings. Consisting of a mounting nut and two gaskets for a tight seal, these plugs install through a hole in a flexible barrier. Remove one gasket and reverse the nut to install plugs in a rigid container. Watch the indicator disc through the nut’s viewing window—it will change color as humidity rises and falls. Made of anodized aluminum, these plugs resist corrosion and are lightweight. They meet military and SAE standards for humidity indicators.

The viewing window on reverse-mounting plugs is on the threaded side, so the nut will be threaded on the outside of your container. They’re easier to install than standard plugs.

For technical drawings and 3-D models, click on a part number.

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.

CSA Certified, CSA-US Certified, CE Marked, and VDE Certified, these humidistats meet American, Canadian, and European safety standards. They also meet UL 94 V-0, so if they catch fire, they self-extinguish within 10 seconds and won’t spread the fire by dripping.

Plug humidifiers, dehumidifiers, and other devices into this programmable controller to turn the equipment on or off when humidity levels reach the actuation point. It has a built-in sensor and accepts any equipment with a three-prong plug. The manual override lets you turn equipment on or off without resetting the programmed settings. The controller comes with a calibration certificate traceable to NIST that states it has passed a test for accuracy.

Turn the dial to control humidity equipment.

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

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.

Check that your material and work surfaces won’t discharge static electricity, which can damage sensitive electronics. These testers are designed to take measurements in accordance with ANSI guidelines for electrostatic discharge control. They measure electrical resistance up to 1×10¹² ohms—five orders of magnitude greater than our multimeters.

These testers measure resistance between two points on a surface and from the surface to a ground. To avoid a sudden release of static, resistance should be between 1×10⁶ and 1×10⁹ ohms.

Use the small parts probe (sold separately) to measure resistance on small items or in hard-to-access areas. Use the packaging probe (sold separately) to measure resistance of thin packaging and films.