Hardy Diagnostics McFarland Latex Standard #2 is a ready-to-use turbidity reference designed for adjusting bacterial suspensions to a standardized density prior to antimicrobial susceptibility testing (AST) and other quantitative microbiology procedures.

Formulated from uniform latex particles, this modern standard mimics the light-scattering properties of the original barium sulfate McFarland standards while offering superior homogeneity, stability, and resistance to light degradation.
Each standard delivers consistent optical density and reproducibility, ensuring reliable results across manual and automated testing systems.

McFarland Standard #2 corresponds to a bacterial density of approximately 6 × 10⁸ CFU/mL, commonly used in microbiology laboratories for calibrating bacterial suspensions to ensure accuracy and reproducibility in sensitivity testing.

Features and Benefits:
• Equivalent to 6 × 10⁸ CFU/mL bacterial density
• Prepared from uniform latex particles for consistent optical absorbance
• Stable, long-lasting formulation reduces light sensitivity and clumping
• Ready-to-use liquid standard — eliminates preparation time
• Compatible with AST, turbidity meters, and visual comparators
• Ensures reproducibility in microbiological assays
• Extended shelf life compared to barium sulfate standards