Each 25ml sachet has a visible lot number and expiry date. The sachet is made of light block and air-tight foil ensuring freshness each time one is used. The Hanna Instruments-9829-10 contains 10 sachets, each of the 10 ppm and 100 ppm Ammonium Calibration Standard (as N).
All calibration buffers are made to a premium quality, produced in accordance with ISO 3696/BS3978 standards using high purity salts, de-ionised water, certified weight-checked balances, and Class A glassware in a temperature controlled environment monitored with certified thermometers.
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