Verification Sample A - Negative

The Verification Sample, A-Negative is used to verify that the ETD instrument is properly calibrated. This product is produced under strict laboratory controls and is engineered using the highest quality materials available. The Verification Sample, A-Negative is packaged in contaminant-free containers and sealed for maximum freshness and longevity.

Please store in a cool, dry place, away from direct sunlight. This product should be stored at room temperature. Clean cotton gloves (Large, Small) are required when sampling to prevent contaminants such as natural oils, dirt, and lotions from interfering with the performance of the instrument.