Hand simulated oscillator second-generation upgraded version

The second-generation upgraded version of the hand simulated oscillator $r $n is designed to simulate the action of manual shaking. The QuEChERS method uses dispersed fillers and matrix to fully mix and extract the target substance. The manual shaking is a key step, and the shaking force varies among different people and states, which may affect the purification effect of QuEChERS and the parallelism of the results.