Acoustic tweezers
Acoustic tweezers (also known as acoustical tweezers) are a set of tools that use sound waves to manipulate the position and movement of very small objects with a diameter of 100 nanometers to 10 millimeters with the max density of any object levitated this way being 5.7 g/cm^3 the sound used to levitate objects is in the range of 20 kHz and higher normally 40 kHz is used for most consumer tweezers and levitators. Strictly speaking, only a single-beam based configuration can be called acoustical tweezers.