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2.4 optical thickness using optical principle. From the test principle is the optical thickness can reach very high precision, but such thickness in the use and maintenance of demanding: You must stay away from the vibration source; strict dust; professional operation and maintenance. Use a narrow range, only for low-rise complex composite films.

2.5 Non-line thickness measurement equipment sales than the larger online thickness measurement equipment, because of its cheap, and with respect to the line thickness measurement equipment, non-gage line can carry more convenient to move; again, off-line use thickness measurement device with the use of online thickness measurement equipment not in conflict, the two can cooperate effectively, improve product yield. For certain samples using a different thickness may get a different result.