| http://www.w3.org/ns/prov#value | - The density of the conductive traces 52 on the substrate 50 is preferably in the range of about 150 to 700 ??m/trace and may be as small as 667 ??m/trace or less, 333 ??m/trace or less, or even 167 ??m/trace or less. [0105] The working electrode 58 and the counter electrode 60 (if a separate reference electrode is used) are often made using a conductive material 56, such as carbon.
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