VEVOR Commercial Vegetable Slicer, 1/4 and 1/2 inch Tomato Slicer, Stainless Steel and Aluminum Alloy Vegetable Cutter Slicer, Manual Tomato Slicer with Non-slip Feet, for Tomatoes, Onions, Potatoes

Yes, it can slice sweet potatoes for tempura, provided they fit within the slicer's maximum cutting size and are not excessively hard. For best results, use fresh sweet potatoes and apply steady pressure while slicing.

This product is only suitable for cutting onions and fruits and vegetables of similar firmness. It cannot be used with very hard fruits and vegetables.