Trace Element Certified Marker, Black, Fine Point Tip, 12 Count ORS NASCO Hollow core fiberglass handle provides better Hollow core fiberglass handle provides better balance and more effective shock absorption than solid fiberglass handles Slip resistant grip Steel wedged and epoxy sealed adze eye assembly fluorescent green indications under ultra violet black light for unbeatable inspection quality and accuracy Great choice for baths which need to be changed out frequently due to drag in or heavy use Ideal for in process testing to detect cracks aeronautic and ship building industries Each marker is identified with the batch number of the ink Writes on most surfaces electronic