The PROOFTESTER™ is a compact and lightweight instrument ideal for testing the strength of optical fibers up to 30 N. The PROOFTESTER™ is developed to meet all types of applications where a strength test has to be performed.

The PROOFTESTER™ is designed with the user in mind. The fiber is easily placed in the guided linear clamps, and the testing starts automatically with a “One Touch” go button.

The built-in microprocessor controls all the important parameters such as pulling force, pulling speed and hold time. This allows for a completely controlled test every time.

The PROOFTESTER™ can be connected to an external PC, which enables access to all programmable parameters and settings. The ProofTester™ is adapted to stand-alone use or to the integration into different subsystems.

The PROOFTESTER™ has an extensive capability of logging and saving information such as pulling force, pulling speed and fiber diameter and other parameters.

Technical data

Fiber buffers 160–900µm
Tensile test 1–30 N
Resolution 0.1 N
Pulling speed 20–100 mm/min
Hold time 0–10 s
Power supply* External 12 V DC, 15 W
Compressed air supply External compressor*, 5-7 bar 4 mm tube instant push-in fitting
Dimensions 210 x 138 x 110 mm
Weight 2.3 kg

NYFORS part number: 60000000

Included in delivery: ProofTester™ unit, PC Software, RS-232 cable, Manual and Tools.

* Not included in delivery


  • Fully automatic
  • High pulling force
  • Easy to operate
  • Logging of test data
  • Compact design
  • PC controlled

Download product sheet

Optical fiber proof testing