Accuracy will be dependent upon your experience with probing a specimen and how cooperative the specimen is while being probed. Having said that, I would recommend the ball-tipped probes if you are new to using such and further recommend you have someone with a high level of experience show you the proper technique and guide you through the process a few times, as technique is critical for acquiring correct results and the safety of the specimen being probed. Merely following written directives or watching a video will not give you the proper guidance...

Good luck,

Jeff
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Jeff Snodgres
University of Arkansas
snodgresjeffreys@uams.edu
501.603.1947

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