METHOD FOR INDICATING WATER QUALITY FOR WATER TANK FOR AQUARIUM FISH AND DEVICE FOR INDICATING WATER QUALITY

摘要

PURPOSE: To simply enable the indication of water quality of a water tank for aquarium fish not requiring a running cost. ;CONSTITUTION: This device for indicating water quality comprises an oscillator 1, a variable resistor 2, electrodes 3, water to be measured 4, a switch 5 and an AC voltmeter 6. The resistance value of water is approximately inversely proportional to the concentration of a nitrate.;COPYRIGHT: (C)1996,JPO