... series of color change. Patented UV tester check low, moderate, high or very high/extreme level of ... color change, compare the color change to the 4 standard colors(low, moderate, high, very high/extreme) around and ... use solar charger or similar solar equipment effeciently:Low: UVI 1-2,Solar energy equipment can not ... UVIndex and SPF of sunscreen you should apply:Low:UVI:1-2,SPF <5,sun protection not ...