Control values with addition and subtraction of two keys, K1 by a number plus 1, K2 by a number minus 1, the values range from 0 to 99.

十位数为0的时候，显示为空白。用两个按键控制数值的加减，按一次K1数字加1，按一次K2数字减1，数值的范围是从0到99。

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Control values with addition and subtraction of two keys, K1 by a number plus 1, K2 by a number minus 1, the values range from 0 to 99.

十位数为0的时候，显示为空白。用两个按键控制数值的加减，按一次K1数字加1，按一次K2数字减1，数值的范围是从0到99。

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