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I a had tester similar to this. Unfortunately, it didn't work very well and would often give me false positive results. Didn't really give me much confidence.
Nothing has changed in 2 years... It still has false positives
Hey we use these pens all the time. Actually the company I work for sells a product that specifically uses these pens. The key to using these pens is that you write them into your procedures. If you guys want to look at them in action heres a link to our facebook page: http://www.facebook.com/pages/Grace-Engineered-Products-Inc/8748547708?ref=ts
I don't mean to spam. Let me know what you guys think of this app.