zwickiLine for Flexible Low-Force Testing.
These extensometers are used for direct extension measurement in tensile tests, flexure tests, and alternating load tests. They all possess a large measurement range featuring stepless adjustment to suit the specimen being tested. Clip-on extensometers and extensometers with sensor arms are in direct mechanical contact with the specimen via knife edges positioned at right angles to the gage length.
The crucial advantage of extensometers featuring non-contact measurement is that they can be used right up to break without risk of damage, even with specimens which are critical in this respect.