Lab Standard Ear Bars have laser-engraved scales, have 50mm of calibration and are 6.2 mm square. Ear Bars for the S51600 and S51900 series of stereotaxic instruments have a different zero point than those for the S51800 series.
Standard 18 Ear Bars taper at the tip to penetrate far into the ear canal for a more secure hold.
Non-puncture Ear Bars have a 45 taper, and do not puncture the tympanic membrane.
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