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

Large clear, dual scale in hPa (hecto Pascal), and mm hg on a 4" diameter dial which is easy to read from a distance. Accuracy of ±3 to 4 hPa. Excellent for classroom or lab use. Wall mount.

Indicates changes in air pressure quickly and accurately. The ball is filled with colored distilled water. Once filled the air trapped inside the ball is no longer subject to variations in atmospheric pressure. The liquid in the indicator tube, however,..

The perfect barometer for giving demonstrations. Features a protective transparent case, air-tight seal, and a pressure bulb to force movements for teaching purposes.