No size is listed because the One Touch uses its own proprietary needle/probe and you can only purchase them from One Touch. They are too large for professional work, and cost more than professional use probes. Someone on here long ago wrote up a thing on how one could modify a one touch to use real live professional probes, but in the end, one really should just get an old used professional machine and be better off. Between the useless overpriced probes and the machine breaking from use, it is not a good financial bet to buy a one touch
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