| 摘要 |
A novel electronic device is described herein that can be manufactured for a cost of less than $10.00, and that can be used by an inexperienced person to measure the TDS in an aqueous solution such as tap water and the conductivity/resistivity of a variety of other substances, materials, and liquids. A phono plug connected to the device is connected to a power source and is immersed in the aqueous solution and causes an LED (in one embodiment) to illuminate to an intensity directly proportional to the TDS in the solution. A rheostat connected to a second LED and power source is then adjusted until the second LED visually is equal in illumination intensity to the first LED. A number is then read from the dial of the rheostat, which number is directly proportional to the TDS of the aqueous solution (or material) and is used as data to compare to future or past readings or to determine the actual TDS using a chart or graph. Also, at least one electrical quantity can be determined, of any substance or material that can be brought into contact with, or into which the plug or any of the adapter leads of this device can be immersed, attached, affixed, contacted or or otherwise connected.
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