These shaker stirrers are recommended for all diagnostic and haematology laboratories as well as series applications. These rugged stirrers are made of sheet steel which has been oven coated with acid-resistant epoxy paint. They are stable, vibration-free and silent. They are fitted with an induction motor which means they are also maintenance-free providing unlimited operation. The electronics in these apparatus provide constant speed even under different weight loads. The instruments come complete with an illuminated green ON/OFF switch and two knobs for setting the operating time and the number of blows per minute; also available is a digital model with digital display of the set values.