... multifunction digital tools-glossmeterIntelligence series gloss meter is widely used in metal,no-metallic,stone,paint,furniture,home appliances,automotive,plastics,and ... .And you will find the date 1N display on screen in the lower right conner. N <=9 times . Meanwhile ,if you ... AVG date and locked . After you press the OK button in short time ,will recovery measurement and can be used again ...