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![UltraRainbow Calibration Particle Kit, 3.8 +/ 0.2µm,2E6/mL, 1x3mL [blank] & 1E7/mL, 1x2mL [fluorescent]](/web/image/product.product/4638/image_1024/%5B0007-URCP-38-2K%5D%20UltraRainbow%20Calibration%20Particle%20Kit,%203.8%20+-%20%200.2%C2%B5m,2E6-mL,%201x3mL%20%5Bblank%5D%20%26%201E7-mL,%201x2mL%20%5Bfluorescent%5D?unique=67e0bf3)