FIELD: well drilling. SUBSTANCE: device for measuring fluid level in well has generator 1 of acoustic signals, piezo-ceramic converter 2 which functions as sensitive element in signal receiver connected to input of secondary recorder including successively connected with circuit noises suppressor 3, low-pass filter 4, amplifier 5 and recording unit 6 with tape drive connected to its second input, and time calibrator made in form of successively connected crystal oscillator 8, frequency divider 9 and switching unit 10 whose output is connected to input of amplifier 5. EFFECT: higher accuracy of determination of fluid level and confidence due to application of time calibrator and noise suppressor in circuit. 3 cl, 1 dwg
