1.Stainless steel housing . 2.Keypad controls the speed, rotating, start/stop, full-speed, easy to operate; 3.For pump head: yz35, 2*yz35 4.Flow range: 400~13000 (ml/min) 5.Four-figure digital led indicator displays working speed . 6.The circuit board with conformal coating makes it dust-proof and moisture-proof. 7.Rs485 interface , modbus communication protocol is available , easy to connect other equipments. Technical parameters Speed range: 30~600 rpm Speed resolution: 1 rpm. Supply voltage: ac220v &ac110v, 50/60hz Hz v: less than 300w Working environment temperature: 0 ~ 40 centigrade Relative humidity: 80% Dimensions: (l *w *h): 340mm*235mm*175mm Weight: 13kg External control functions: External control start and stop, external control orientation, isolated, ttl electrical level input optional; 0-5v/10v, 4-20m optional. Dinmensions:340*235*175mm Weight:13kg