1. It is powered by both AC and DC, features low power consumption, and has a compact and elegant design, making it convenient for use in the field or laboratory (portable whiteness meter). 2. It is equipped with a low-voltage indication, automatic shutdown and low-power consumption circuit, which can effectively extend the battery life (push-type whiteness meter). 3. It adopts a large-screen high-definition LCD liquid crystal display, which is comfortable for reading and not affected by natural light. 4. The adoption of low-drift integrated circuits and high-efficiency long-life light sources ensures the instrument operates stably for a long time. 5. A reasonable and simple optical path design ensures the accuracy and repeatability of the measurement values.