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Message: <blockquote data-quote="phoenix" data-source="post: 173781" data-attributes="member: 12578">calibration and controling are two different things.Calibation is adjusting the meter to the new batch of strips. Some meters use a code, some use a chip, some use a special strip and some don't need 'coding' as the strips don't vary from   batch to batch.Errors in calibration may lead to  errors in readings.<a href="http://www.diabetesmonitor.com/m28.htm" target="_blank">http://www.diabetesmonitor.com/m28.htm</a>Controling is checking whether the meter itself is working within tolerances and is done with control solution.  My one Touch says it should be controlled once a week and each time you open a new tub of strips.The trouble is the tolerances are very wide so it needs a big change for them to 'fail' the test.  If I could get it easily I'd use it but as I've only ever been able to get hold of it at the hospital here  that's not very often.  I do have 2 meters from the same manufacturer so I'll sometimes check that they give similar readings (they're never the same).</blockquote>

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