AOPI Staining Solution for the detection of live and dead nucleated mammalian cells. One 5mL vial, good for approximately 250 tests. Product warranty is valid until expiration date stated on the product label. If no expiration date is listed, warranty is valid for 12 months from the date of receipt of the product. Compatible with Cellometer Auto 2000, Cellometer Auto X4, Cellometer X2, Cellometer K2, Cellometer Vision CBA and Celigo Imaging Cytometer.