Easy-to adhere stickers having side-by-side twin grids (20mm x 20mm each with 1mm line spacing) for microscope slides. Count or measure cells More easily count or measure cells. Compatible with different styles of microscopes (conventional, inverted or dissecting). Use with dry specimens or suspended specimens such as cells held in buffer under cover slips. Made of polyester with an acrylic adhesive. Slide-Grids are inert and stable under most laboratory conditions.