* When the meter is not in use, please always keep the cover of the light receiver in its place to avoid the damage from wearing out.
* Do not touch the Light Sensor (white part) with the bare hands.
* To clean the Light Sensor only with the dry flannel fabric or the equivalent material. Any kind of detergent that may hurt the Light Sensor is absolutely forbidden.
◇ Low battery condition:
* When the battery voltage is under proper operation requirement, thesymbol will show on the LCD and the battery need to be replaced with a new one for an accurate data measurement.
◇ Overload Condition:
* When"OL" shows on the LCD, it means overload and the user should select a prper measuring range for testing.
* This meter is not suitable for measuring the light (such as sunshine) when "OL" shows on the LCD under the maximun range 20000 Lux (YJ2A50) & 200000 Lux (YJ2A51) is selected.
* Please avoid to use the meter for measurement in the environment of high temp. or moisture.
symbol will show on the LCD