Review on Opticz UV Blacklight Reactive Large Tip Blue Invisible Ink Marker by Sasha Hsiao

Review this Product -> Opticz UV Blacklight Reactive Large Tip Invisible Ink Marker, BlueWorks well. I use this in conjunction with my UV light listed here -> (Black Lights UV Flashlight, TaoTronics 51 Ultravilot Dog Urine Detector, Pet Spot Detector, Dog Urine Remover, Bed Bug Detector with UV sunglasses and Duracell batteries included) (note : Works (The word "ultraviolet" is misspelled in the Revains product description) I use a pen to write on my electrical plug the circuit number on the HVAC channels to remind me of the filter size, and then use the light, to see his (usually you can't see what you write with this pen)