Body marking pens from my job at the hospital. We use them in ultrasound to mark the position of the transducer to ensure it is in the same place each time on the patient. The doctors use them to mark their biopsy entry points too.
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I'm really mad because I know what these so I'm giving myself 24 hours to come up with it. For now it's a comment, tomorrow it'll be +1 if I can't come up with a guess.
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