Placing magnet behind magnetic flux viewing film changes color by magnetic level.
Color change according to magnetic intensity
Color Gauss
50-100G Orange
100-150G Yellow
150-250G Light Green
250-300G Green
300-500G Dark Green
600-800G Blue
900-1000G Dark Blue
Film thickkness (μm): 150~200
Heat resistance test: 75℃ 48H
Coonstant temperature and humidity test: 60℃/80℃ 48H
Outdoor exposure test 48H