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Measurement Guard banding will be reported when the Test Uncertainty Ratio (TUR) is below a specified trigger level.  Guard banding tightens the acceptance limits by subtracting a percentage (Z Factor) of the EMU from the tolerance limits. The values of 4:1 TUR and 30% Z-Factor are considered default. 


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If paying by ACH, please send your ACH registration form to  Cal Lab cannot process orders without confirming the form has been received by your Accounts Payable Department. 

Tax Exemption (Wisconsin Businesses Only)

Please send Tax Exempt certificate to

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