i done my puspakom check up last month, with removing all tinted still the reading 80%

Finally i passed the test! Imagine without any tint at all on the front windscreen also 79% VLT!!? Wth?
And compared to the values before, my other window's tints values not same, i think it's really their device not accurate because i didn't do anything to my other 5 tints at all.