Category: Microplate Readers | Subcategory: Microplate

Bio-Rad xMark Microplate Absorbance Spectrophotometer

Bio-Rad xMark Microplate Absorbance Spectrophotometer Image

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Bio-Rad xMark Microplate Absorbance Spectrophotometer ImageBio-Rad xMark Microplate Absorbance Spectrophotometer ImageBio-Rad xMark Microplate Absorbance Spectrophotometer Image

With its unique imaging capabilities, monochromator design, and spectral scanning feature (which eliminates the need for filters), the xMark™ Microplate Absorbance Spectrophotometer can find the best wavelength within a broad range for any photometric application. The xMark Spectrophotometer is also flexible enough to read all standard microplates, from 6- to 1,536-well formats. Using Microplate Manager® Software, the xMark Spectrophotometer can perform a wide range of end-point and kinetic applications with spectral scanning within low UV to infrared wavelengths. Extensive data analysis includes comprehensive curve-fit models and automated data export in single-plate or batch formats.

Features and Benefits:

  • Monochromator-based system for maximum optical efficiency and flexibility in photometry reading
  • Spectral scanning to define the best absorbance wavelength for assays
  • Imaging capabilities for pixel intensity data in a single well or entire plate
  • Ability to scan custom plates
  • Flexible control and data analysis with PC or Mac software
  • Incubator with programmable temperature control
  • Plate Compatibility: Compatible with 6- to 1,536-well and custom microplates 128 mm L x 88 mm W
  • Plate height: cannot exceed 21 mm
  • Clear flat-bottom plates  are recommended such as Bio-Rad's Costar 96–Well Flat–Bottom EIA Plate (2240096)
  • U-Bottom plates can be used, but V-bottom plates are not recommended


  • Optical
    • Wavelength range: 200–1,000 nm
    • Photometric methods: Single and dual wavelength
    • Monochromator step size: 1 nm
    • Bandwidth: 5 nm
    • Wavelength accuracy, minimum: ±2.0 nm
    • Wavelength repeatability: ±0.2 nm
    • Imaging resolution: 0.5, 0.75, 1.0 mm 
  • Performance
    • Indication range: 0–4.0 OD
    • Resolution: 0.001 OD
    • Linearity: ≤2.0%, 0–3.0 OD at 405 nm
    • Accuracy: ±1.0% or 0.015, 0–3.0 OD
    • Reproducibility: 96-well plate; ≤1.0% or 0.005, 0–3.0 OD at 405 nm
    • Stability and drift: ≤0.010 at OD = 1 at 490 nm
    • Read time: 8 sec/96-well/single wavelength; 15 sec/384-well/single wavelength; 35 sec/1,536-well/single wavelength
  • Physical
    • Compatible plates: 6- to 1,536-well and custom microplates 
      Maximum plate height: 21 mm 

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