xMark™ Microplate Absorbance Spectrophotometer



Absorbance Linearity Test Report in Checkmark Software
Absorbance Linearity Test Report in Checkmark Software

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
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 
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
Compatible plates  6- to 1,536-well and custom microplates 
Maximum plate height  21 mm 

Account price failed to display. Please try reloading the page. Reload Page

If you are placing an order, you may proceed with your order; the account price will be applied if it is lower than the
list price. If the problem persists, please call customer service at   or send an
email to 

Waste Electrical and Electronic Equipment ("WEEE Directive")

This product contains electrical or electronic material. Learn more about Bio-Rad's EU Recycle Program

xMark™ Microplate Absorbance Spectrophotometer
xMark™ Microplate Absorbance Spectrophotometer

PC or Mac, includes built-in incubator, plate shaker, Microplate Manager® 6 software (#168-9520), USB2 cable

List Price:
Your Price:

Communication error

Reload Page

Your Price:   Log in
Quantity:   Add to Cart
Add to Hot List   Add to Quote
Number Description Options
10013301x xMark Microplate Spectrophotometer User Manual Click to download
5671 xMark™ Microplate Absorbance Spectrophotometer Insert, Rev B Click to download [ Add to Cart (Free) ]
10011683 Instruction Manual, Microplate Manager v. 6.0, Rev B Click to download