Inoculation density standardization is routine in antimicrobial susceptibility testing. In-Spec, your trusted name in affordable, NIST traceable spectrophotometer calibration check standards, now has an easy to use alternative to Barium Sulfate standards.

In-spec McFarland Standards are perfect for any situation:

• Visual comparison
• Quality control for spectrophotometer comparison
• Calibration of automatic inoculation density meters, nephelometers & turbidimeters

In-spec McFarland Standards are:

• Ready to use – no need to re-suspend the solution each time**
• Stable – guaranteed one-year shelf life as opposed to 6 months for barium sulfate standards
• Non-toxic – no concerns with handling, storage or disposal
• NIST traceable – Consistent particle size, distribution, and density
• Various forms for ease of use
  • Prepackaged for some automated systems
  • Ready to use bottles for use in laboratory glassware
  • Multiple concentrations to best meet your needs.
  • Pre-filled culture tubes

Individual standards and kits are available to meet your requirements. In-spec McFarland Standards are the easiest, most adaptable means of standardizing inoculation density.

Catalog Numbers

Item # 8319 – 1.0 McFarland Standard

Item # 8320 – 1.5 McFarland Standard