feature: 1. Integrated Design with elegant appearance. 2. Internal Isolated Sampling with accurate measurement. 3. Easy to operate and home calibration guaranteed. 4. Dynamic password to prevent duplications. 5. Build-in motor valve with high reliability. 6. English display on big screen for easy observation. 7. Low energy consumption , more than 6 year battery life. 8. both single liquid crystal display and liquid crystal together with digital wheel display are available.