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.

Meters measure indoor relative humidity and indoor and outdoor temperatures.

Quickly weigh the moisture in an object or substance. Also called moisture analyzers, these scales help with a variety of tasks, from measuring the liquid content of concrete to the concentration of medications. They work by weighing your sample before and after it’s been dehydrated to determine its moisture percentage. A halogen light or carbon fiber heating element quickly and evenly heats samples inside a reflective chamber.

Use the quick setup function to automatically analyze a sample and create a testing method. These scales have a standard drying speed setting that heats your sample without over drying it. Use the fast setting to quickly heat the chamber to drying temperature, however this setting is more likely to over-dry a sample. To stop a test, there are three different modes—manual, automatic, and timed. Automatic mode allows you to set your own criteria to stop the test once moisture loss is no longer detected. To zero the scale after a weighing pan has been placed on it, simply press the tare button. Print your measurement data or send it to your PC using a USB or RS-232 cord (not included).

These testers come with a reusable pan to place your sample in. For samples that could spit and spatter when heated, place your sample on the rough side of the included fiberglass pad. Use a disposable aluminum pan (sold separately) for samples that are difficult to clean.

Check the moisture content of wood and other building materials. Meter uses two noninsulated electrode pins that are mounted directly to the meter. For deeper penetration, two insulated electrode pins attach to the meter with a 3-ft. cord.

This unit has three scales. The wood scale measures moisture from 6% to 60% in lumber, studs, and flooring. The drywall scale measures moisture from 0.1% to 6%. A comparative reference scale reads from 0 to 100 and is used in nonwood materials such as concrete, insulation, and roofing. Meter accumulates up to 100 readings and gives you an average.

Meters measure indoor relative humidity and indoor and outdoor temperatures.

Determine relative humidity within ±4% accuracy and temperature within ±1.8° 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.

Obtain continuous temperature measurements from a wet-bulb and a dry-bulb thermometer to determine relative humidity. This wall-mount humidity meter 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. These humidity meters have a built-in slide rule for calculating humidity without a calculation table.

Meters with accuracy certificate come with a document stating they’ve passed a test for accuracy.

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.