FIELD: measurement technology; agriculture. SUBSTANCE: device has pipe line 1 for water supply under pressure, disc 2 with ground specimen 3, upper disc 4 with tube 5 for vacuummeter 8, body 6 with water-drain hole 7. Vacuummeter is provided with electric output and connected to signal amplifier 9 to increase accuracy of taking the information about washing-out process. Amplifier 9 is connected to analog-to-digital converter 10 connected in its turn to computer. EFFECT: higher measurement results. 1 dwg
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