Elliot Scientific has released the E4100 QPD Force Measurement Optical Tweezer System, which uses a Quadrant Photo Detector (QPD) in conjunction with powerful software to detect and measure the single trap stiffness of a captured particle.
Complete Force Measurement Optical Tweezer plug'n'play systems can be supplied, or Elliot Scientific can add this capability to an existing tweezer installation. Retrofitting to a good quality microscope is also a viable alternative if there are budget limitations. Multiple QPDs and/or an auxiliary probe beam are among a number of options Elliot Scientific have on offer.