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Each piece has its light transmittance value printed on the label These values are accurate to within ±1% of a N.I.S.T. calibrated spectrophotometer The reference samples work with any Laser Labs tint meter
The reference samples work with any Laser Labs Tint Meter. To verify that the tint meter is working properly and within specifications, take a reading of the reference samples before you begin to use the tint meter. The meter should display a reading of not more than ±2% of the value printed on the label.