Digital circuit control from time to time to ensure the stability uniformity of liquid; 1. Using high-precision electromagnetism valve, the flow capacity coefficient is 0.18CV; 2. With vacuum control system to eliminate drip phenomenon; 3. Control mode: Artificial time; 4. Sustainable spit every time lowest at 0.01ml, it will help reduce production costs; 5. High-performance, simple and easy to assemble. 6. Power supply: AC 220V ± 1050Hz / AC 110V ± 1060Hz