A versatile uniaxial benchtop mechanical tester for biomaterials

The UStretch is not limited to dry, vertical testing with bulky specimen grips.  It is capable of both vertical and horizontal testing in or out of a temperature-controlled media bath.  The system also has a wide range of specimen attachments including screw-driven clamps, spring-loaded clamps, and multi-point puncture grips.

Key Features

  • High-performance actuator with inline load cell
  • High-resolution CCD imaging with image-based strain measurement tools
  • Several attachment options including patented BioRakes for fast and reliable specimen mounting
  • Integrated temperature-controlled media bath
  • Fully featured user interface software for simple, cyclic, relaxation, and multi-modal testing with real-time feedback

Specimens & Mounting



The patented BioRake attachment system allows specimens to be mounted quickly and precisely.

BioRake Sample Mounting System

Mechanical Grip

The mechanical grip attachment system facilitates higher forces and test-to-failure.

Mechanical Grip


Integrated software makes it easy to specify test protocols, whether simple or complex. Test protocols can be saved and modified. Real-time force and displacement graphing facilitates test validation.

The UStretch software is built on the same platform as the BioTester software.

Ustretch Software

Imaging System

Optional imaging system and analysis software allows images to be analyzed to verify specimen strains and strain uniformity.

Ustretch Software

What Our Customers Are Saying

Don’t just take it from us, let our customers do the talking!

We regularly use both the Biotester and UStretch in our lab for mechanical testing of intervertebral disc tissue. Both systems use similar mounting fixtures and software, making working between the two systems seamless, yet each system offers unique testing solutions. We have been very pleased with both the ease of developing test protocols and with the quality data Cellscale products afford.

A comparison between porcine, ovine, and bovine intervertebral disc anatomy and single lamella annulus fibrosis tensile properties.

The aging disc: using an ovine model to examine age-related differences in the biomechanical properties of the intralamellar matrix of single lamellae.

Prof. Diane Gregory

Wilfred Laurier University

We started working with the Cellscale UStrech 3 years ago to determine biomechanical properties of eye cornea. The handling of the device is easy and processing acquired data is very convenient. The customer service has been excellent, and they are very helpful.

Intrastromal Application of Riboflavin for Corneal Crosslinking

Dr. Theo G. Seiler

IROC Institute


Dimensions 60 X 18 X 9cm
Weight 9kg
Force Capacity 44N
Available Load Cells 0.5, 1, 2.5, 4.5, 9, 22,44N
Force Accuracy 0.2% of load cell capacity
Maximum grip separation 135mm
Maximum Velocity 50mm/s
Maximum Cycle Frequency 2Hz
Maximum Data Rate 100Hz