This is the Aneroid Barometer, model: TCH/AB-2 Demonstration Type. Made in India. Measuring Range: 660mmHg to 880mmHg. and 27 Inch Hg to 34 Inch Hg. Analog Barometer. No electrical power is needed. Pump ball/bulb included. A Product by: Sandeep Automats. Product Size: 13cm x 12.5cm x 4.2cm, Materials: ABS Plastic.