Everything mentioned in the more negative reviews materialized, plus some. The mechanisms that hold the pin sensors don't move smoothly or move at all. It takes some work to get them to retract when you need to replace the sensor. I ordered three - one can really only be used on one side (the other literally popped out - I assume the ends are glued?). You don't hold the pens very well. The third works well so far (sensors are configured, so will not be changed). I think keep looking and maybe spend a few bucks more on another brand.
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