Use the sling psychrometer with wet bulb, wick, and rubber band; and dry bulb thermometer to measure humidity and dew point by rotating on a plastic handle. Includes an eight-page activity guide.

Accurate Holosteric barometer with dial calibrated in inches of mercury, centimeters, and millibars. Gilded case, 3-1/2" silver dial.

An attractive, jumbo thermometer, easy to read from a distance. 12" diameter. Features Fahrenheit, Celsius, and relative humidity scale. Hang indoors or outside. All metal construction, plastic face cover.

Simple yet effective! The apparatus consists of a glass bulb having two tube outlets. One of these is attached to a rubber bulb, the other to a rubber tube having a pinch clamp. The rubber bulb is partially filled with water. Smoke is introduced ..

This model vividly demonstrates the character and interaction of air masses, pressure, and heat energy. To help explain weather forecasting, the basic warm and cold fronts are in transparent plastic, so the student can visualize their movements and rela..

This three-dimensional demonstrator creates a water cycle as it occurs in nature. A fascinating, ingenious experimental model that actually causes the rain to fall, then evaporate in a continuous cycle. It also graphically shows distillation of wate..

Ideal for use in greenhouses and plant life industries. Large, bold numbers and color coding of maximum, minimum, and current temps. Dual scale. Reset knob. Free standing or key hole mountable. Easy to read. Compact and durable. Indoor/outdoor. No batte..

Timeless metal styling for years of use. This wall-mount thermometer features an antique brass-look metal frame with traditional white face and black numerals, glass lens, simple two-screw wall mount, and pivoting arm for easy viewing. #11;6"..

15 sling psychrometers with wet bulbs, wicks, and rubber bands; and dry bulb thermometers to measure dew point and humidity by rotating on a plastic handle. Includes 15 eight-page activity guides.

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A standard hygrometer using the wet bulb and dry bulb method to determine air humidity. Two red liquid-filled thermometers are secured to the plastic scale plates. Water is supplied to the wet bulb thermometer by a siphon reservoir. Black temperatur..