This non-contact tachometer is a game changer for those who work in the Industrial and Scientific field. According to my experience, this compact device is highly accurate and easy to use. Its batteries last a long time and its back-lit display is bright enough to use in any light. The convenience of not having to physically touch the measuring object is a true blessing. However, it is a bit expensive compared to some other products in the market. Overall, it's a handy tool that saves time and provides reliable measurements according to my experience.