Water-level measuring device using gear ratio

A water-level measuring device measuring a water level by using a gear ratio, the water-level measuring device comprising:

• a water pool filled with a liquid;
• a plot receiving buoyancy by being floated over a water surface of the liquid filled in the water pool;
• a cable connected to the plot and extending to the outside of the water pool;
• a first gear connected with the cable;
• a second gear connected with the first gear;
• a weight pendulum connected with the second gear and moving in up and down directions;
• and
• a water-level transmitter including a space into which the weight pendulum is inserted and in which the weight pendulum is configured to move,
• wherein when the water level of the water pool descends, the weight pendulum ascends due to a weight of the plot, and when the water level of the water pool ascends, the weight pendulum descends due to the buoyancy of the plot,
• wherein the weight-level transmitter is configured to transmit a signal to the outside according to a movement of the weight pendulum.