It has an analogue timer to adjust the operating time between 0min-60min, users can simply turn the dial to the desired time to start the operation. SQ Analogue model support full diameter range 200 SQ Analogue is built with a stable electromagnetic motor. 200 SQ Analogue is suitable for laboratory use. 300,315, 450 SQ Analogue models are motorized shakers and are ideal for heavy-duty.