The first came out of the box. The instructions say to soak the storage solution an hour before use, so I ordered the solution and did. Still deviates by 0.15 after the 6.86 calibration powder. Sent back for exchange. If the second one works exactly I'll update the review, if not know it's not out of the box (which is what I was hoping/expecting). To edit; Pen #2 was soaked in storage solution for one hour as indicated. The 6.86 calibration solution shows 6.9, so I think it's pretty accurate. Let's see how long this lasts.
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