Magnetic stirrers are used in labs . They are available in two designs,with hot plate/without. The stirrer with a hot plate is made of metalsheet with stainless steel top which serves as a hot plate . Its stirringand heating unit are thermally insulated with asbestos sheet laminated with asbestos cement . It is fitted with an electronic regulator to control the speed  of the stirrer . A energy regulator adjust theheating of the hot plate . The apparatus work on 220/230VAC. It is finished in oven baked paint.