A home-made apex locator.
Foreman
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Howat
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D003786:Dental Pulp Cavity / Q000033:anatomy & histology*; D004581:Electronics / Q000295:instrumentation; D006801:Humans; D009811:Odontometry / Q000295:instrumentation; D012390:Root Canal Therapy / Q000295:instrumentation*; D014092:Tooth Root / Q000033:anatomy & histology