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creating the hole for the sensor

#1
Sometimes, I find drilling into concrete a a bit of a challenge depending in the slab; some slabs seem harder than others and control of the bit is more difficult. QUESTION: What factors make a hole unsuitable for testing? I've had cases where the depth was right but the sensor would not go in even using the tools and recommended methods; then, after one more (in and out) with the bit, the the sensor went in easily without much effort. If the sensor goes in too eaisly is the hole still usable?
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#2
I'm wondering if your drill bit is worn down. My sensors are never 'easy' to put in, but I've noticed it is more difficult when I use an older bit. W hen I drill in concrete the two things my bit needs to be is: relatively new and have a pyramid tip.
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