BMP 21 Label Cartridge; 1/2 inch W, Permanent Vinyl, White. The BMP 21 portable label printer is an all-in-one labeler. With label materials designed for a variety of environments, the BMP 21 portable printer can quickly and easily create clear, legible labels that stay in place for years - despite extreme temperatures and curved or highly textured surfaces. Printer operates on either six AA batteries or AC power adapter. Print labels in sizes specifically made for vials and slides. Vial size fonts are preprogrammed for 0.6, 1.5 and 2.0 mL. The laboratory-specific labels resist most chemicals, including alcohol, ethanol and the solvent DMSO. Choose from 3/8, 1/2 and 3/4 inch wide labels in white or clear tape. Labels are designed for normal to extreme conditions, like liquid nitrogen or hot water baths.