Discard Expired Buffer
The expiry date indicates until which date the certificate guarantees the value and the associated measurement uncertainty. After this date the uncertainty cannot be guaranteed.
Use a fresh aliquot of buffer for each calibration to ensure no contamination enters the bottle. Do not calibrate directly in the solution bottle.
Use enough buffer for accurate calibrations. The sensor should be submerged in the solution in order to achieve the most accurate results.
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What is a dissolved oxygen standard solution used for?
A dissolved oxygen standard must be used to obtain reliable results at low oxygen levels. METTLER TOLEDO offers zero-oxygen tablets to make the preparation of the dissolved oxygen standard fast and easy.
What is the shelf life of the zero oxygen tablet?
Zero oxygen tablets have a 2-year expiration date, which is encoded on the box.