All products sold by our store, we will provide the strict assurance of the quality and excellent service, you can feel comfortable to buy and use. 2 heads: Heating temperature: normal temperature +5-99.9 Stirring capacity: 20-1000ml Motor power rate: 25W×2 Heating power rate: 250W×2 Stirring speed: start~2400R/min Temperature control range: RT+5～99.9℃ (digital display temperature control) Working face diameter: ∮130×2 Heating plate material: stainless steel Package size: 40.5*39*23.5cm Package weight: 4kg 4 heads: Heating temperature: normal temperature +5-99.9 Motor power: single motor 25Wx4 Hotline power consumption: a single hotline up to 200Wx4 Electromagnetic steel speed: maximum 1600 rpm Package size: 66.5*39*20cm Package weight: 8kg 6 heads: Heating temperature: normal temperature +5-99.9 Motor power: single motor 25Wx6 Hotline power consumption: a single hotline up to 200Wx6 Electromagnetic steel speed: maximum 1600 rpm Package size: 96*39*20cm Package weight: 12kg Precautions: 1.When you find that the stir bar is beating or not stirring during stirring, please cut off the power to check whether the bottom of the beaker is flat and the position is correct. 2. Generally, the heating time should not be too long, and the intermittent use will extend the life. 3. Medium-speed operation can work continuously for 8 hours