Numeric advancing does not always work. Purchased for counting Physical Therapy reps

For the price.... it is a counter that works most of the time. Purchased for counting Physical Therapy (PT) reps and noticed the counter did not always advance. I made sure to push the advanced leaver/button as consistently as possible, but still 1-2 reps per 30 did not advance. Again for the price and the fact that 1-2 extra reps were ok... I would probably purchase it again for PT uses.

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