Shopping in daily life is relatively simple. For instance, you can choose what style and color of clothes you like to buy, or when purchasing a computer, just select the necessary configuration. All these can be learned in life. When making a purchase, you just need to compare whether it is good quality and low price. But when purchasing some items that we have less contact with, what should we pay attention to when making a purchase? This requires consulting relevant materials and then making a decision based on the needs. The steps may be more complicated than usual, but choosing the right one that can play the greatest role is the fundamental. Taking the ultrasonic cleaner as an example, how should one choose when purchasing? The following is a brief introduction to the purchasing precautions by the author for everyone.