The Oxford Lab Products BenchMate 20 L Digital hotplate stirrer is a high capacity hot plate stirrer unit. It can heat and mix up to 20 L at one time, with a maximum stirring speed of 2200 rpm. The BenchMate 20L Digital hotplate stirrer is designed for all sorts of mixing applications, from gentle to vigorous mixing. This flexibility in volume and mixing speed gives you great versatility from one unit in the lab. These BenchMate MS1 and MS4 magnetic stirrer units have no moving parts, so there are no parts to wear out due to friction. The adjustable speed range of these units depends on the model. The MS1 speed range is from 15 rpm to 1, 500 rpm, and the MS4 speed range is from 15 rpm to 1, 200 rpm. The corrosion-resistant stainless steel top surface fights any damage or corrosion from harsh chemicals.