8pcs 3/6/15mm Liquid Chalk Marker Pens LED Writing Board Glass Art Pen Window Automatically lock the readouts when

Automatically lock the readouts when data is stable

the 4-channel design also enables it to roll 360 degree in the air

Please allow 2-3mm differences due to manual measurement

- The knife block is strategically embedded magnetic surface

8pcs 3/6/15mm Liquid Chalk Marker Pens LED Writing Board Glass Art Pen Window Automatically lock the readouts whenFeatures: 8 X 3mm 8 X 6mm 8X 15mm Tip Chalk Markerstip Liquid chalk markers are great for use in Cafes, Restaurants, Schools, Offices, Clubs, Pubs and many other places where you need to get the attention of your customers or staff. Also great for office and home notice boards or kids and themed parties. Ideal for writing on LED writing boards, windows, glass, glossy boards, acrylic blackboards ( not for the tranditional blackboards), car windows,