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Precision Hair Hygrometer
Hygrometer for measuring the relative air humidity, consisting of a round plastic housing with a human hair as the measuring element. The specially treated hair exhibits an almost inertia-free response to changes in humidity. Wall-mountable. Measuring range: 0% 100% relative humidity Temperature…
Item: U14293
$ 43.00
Original Power House
…panels, windmill, greenhouse, and desalination system. You can build and operate an electric train, windmill, solar cooker, solar hot water tank, hygrometer, electric motor, power hoist, sail car, and more! Plant watercress, prepare sauerkraut, and make chewing gum. Learn how plants convert sunlight into…
Item: U49445
$ 150.00
