Open the 2 screws on the back of the product, push the battery cover, remove the battery separator, put the battery back into the battery compartment according to the label, and the product is ready to use. use. When the air and ground temperature is between 15C and 30C, the temperature zone is displayed and other ranges are displayed. When the humidity is between 60% and 80%, it will be displayed in the humidity zone and displayed in other zones There are 9 intervals of light intensity: Weak-(LOW-), Weak(LOW), Weak+(LOW+), Moderate-(NOR-), Moderate(NOR), Moderate+(NOR+), Strong-(HGR-), Strong (HGR), Strong+ (HGR+ ) Press / to switch between (Celsius) or (Fahrenheit) display During the measurement process, press the HOLD button to lock the value of current temperature and humidity measurement, and at the same time, the backlight is on for about 10 seconds, press the lock button again to unlock, and the backlight is off; you can return to normal measurement; if there is no manual contact lock within 15 seconds, it will be unlocked automatically after 15 seconds.