Mastech MS6300 is a versatile instrument for measuring sound level, illuminance, temperature, relative humidity, wind speed, and airflow. With its easy-to-read LCD display and backlight, you can use it even in low-light conditions. The auto power-off feature conserves battery life, so you don't have to worry about replacing them frequently. It also has a data hold function to freeze the current reading on the display, allowing you to record the data more conveniently.