Combination laboratory stirrer and stir-tester. The HST20 lets you maintain stirring speed with a 1/8 hp, totally enclosed, permanent-magnet DC motor. The direct-drive model provides speeds up to 2500 rpm and 3.6 lb.in of torque. The geared model gives 2 to 265 rpm and torque of 21 lb.in. Other models provide torques up to 96 lb.in.

The system is furnished complete with drive motor, mounting bracket, controller, 3-jaw keyless chuck, propeller, heavy-duty 90-degree clamp. Lab stand not included.