... Water Meter Small Range: 4m, 6m, 8mMedium Range: 8m, 10m, 12mLarge Range: 15m, 20m, 30m, 40mMT Two-wire Series ... power supply.The MTU series is a multifunction type four-wire ultrasonic Level Meter, which is of DC ... processor technologyHi-lo double relays --MTU four-wire series provides this functionAll plastic anticorrosive shell-- protection level ... Smart LCD/LED display screen Ultrasonic Water Meter