Handler 78-RK 78-RK Atlas Heavy Duty Tri-Speed VibratorHandler 78 RK The NEW Handler 78 RK Heavy Duty Vibrator is built for durability and rugged use. The newly designed 78 RK has two frequencies each with variable speed. The HIGH and LOW are variable to allow a technician to vibrate a mixing bowl or flask at the correct speed for the plaster, stone or viscous solution to de bubble. The fully covered large rubber table is built to hold larger flasks and mixing bowls. The rubber top is removable for easy