Piezo Liquid Sensor Design

I have a piezo-based wet/dry sensor concept that relies on tracking resonance changes in a PZT ceramic between 20 kHz and 500 kHz. When the tip is in air the vibration is high-Q with a large voltage swing;... (Budget: ₹600 - ₹1500 INR, Jobs: Analog Electronics, Electrical Engineering, Electronics, Embedded Systems, Firmware Development, Microcontroller, PCB Layout, Signal Processing)