United States
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| Product Center | |
 BBL™ CrystalSpec™ Standards |
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| Cat. # | Desc. | Qty. | Unit |
| 245015 | BBL™ CrystalSpec™ Standards | 1 | EA |
The CrystalSpec™ Nephelometer is a battery-powered, portable device designed to measure the turbidity of microbial suspensions equivalent to McFarland standards 0.5 through 4.0. The instrument can be used for any laboratory procedure that requires inoculum density adjustments within this range.
| Catalog # | Description | Quantity | Unit |
| 245015 |
BBL™ CrystalSpec™ Standards
Set of two calibration standards for the BBL™ CrystalSpec™ Nephelometer. One Calibration Blank and one Calibration Standard
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1 | EA |
The CrystalSpec™ Nephelometer is a battery-powered, portable device designed to measure the turbidity of microbial suspensions equivalent to McFarland standards 0.5 through 4.0. The instrument can be used for any laboratory procedure that requires inoculum density adjustments within this range. The CrystalSpec™ Nephelometer is a battery-powered, portable device designed to measure the turbidity of microbial suspensions equivalent to McFarland standards 0.5 through 4.0. The instrument can be used for any laboratory procedure that requires inoculum density adjustments within this range. The visual comparison of organism suspensions to turbidity standards is an accepted method of estimating organism densities. The most widely accepted standard is the McFarland standard.1 A McFarland standard is prepared by adding barium chloride to aqueous sulfuric acid. The density of the resulting barium sulfate precipitate can be used to approximate the colony count of a prepared suspension; e.g., McFarland 1 is the equivalent of approximately 3 x 108 CFU/mL. Other standards have been used for density measurements, including titanium dioxide2 and latex particle suspensions.3 The instrumented measurement of turbidity relies on the ability of particles to scatter light while in suspension. The measurement of this scattered light is referred to as nephelometry.4 In order to obtain an accurate density measurement, a reliable method of calibration must be used. The visual comparison of organism suspensions to turbidity standards is an accepted method of estimating organism densities. The most widely accepted standard is the McFarland standard.1 A McFarland standard is prepared by adding barium chloride to aqueous sulfuric acid. The density of the resulting barium sulfate precipitate can be used to approximate the colony count of a prepared suspension; e.g., McFarland 1 is the equivalent of approximately 3 x 108 CFU/mL. Other standards have been used for density measurements, including titanium dioxide2 and latex particle suspensions.3 The instrumented measurement of turbidity relies on the ability of particles to scatter light while in suspension. The measurement of this scattered light is referred to as nephelometry.4 In order to obtain an accurate density measurement, a reliable method of calibration must be used. The meter must be calibrated with the supplied CrystalSpec Calibration Blank (B) and CrystalSpec Calibration Standard (S). The use of other standards will result in miscalibration of the instrument. The CrystalSpec Standard is to be used only for calibration of this instrument and not as a visual, i.e. manual approximation to a barium sulfate McFarland standard. Do not use the CrystalSpec Nephelometer for measurements outside the range of McFarland standards 0.5 – 4.0. Volumes below 2.0 mL cannot be measured in the instrument.Clear, flat bottomed glass tubes, 16 – 17 mm diameter must be used for samples. For best results we recommend 9 V Alkaline batteries. Do not use in direct sunlight. CrystalSpec Nephelometer, including a CrystalSpec Calibration Blank (B), CrystalSpec Calibration Standard (S), Low Volume Sample Adapter, and 9-volt battery. in vitro Diagnostic Read all instructions before use and follow precisely. | |||||||||
Information shown on this page is a short summary extracted from the Package Insert, available as a PDF under the Related Documents section of this page.
