NASA NTRS · 19730000010
Remote measurements by telephone
Abstract
Inexpensive device permits measurement and remote interrogation of variables such as voltage, temperature, pressure, or humidity by standard telephone equipment. Remote interrogation of wind direction and velocity, humidity, or water levels on flood-prone river are other possible representative uses for this device.
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Miller, R. L.. 1973-03-01. Remote measurements by telephone. https://ntrs.nasa.gov/citations/19730000010
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