SME 2330 or 2340 series Tape Extensometer is used to measure small movement between two reference points. Digital display for fine adjustment is provided which makes its use very simple to the extent that even a layman can easily use it with a little practice. Extensometer basically comprises of an anodized aluminum body, steel measuring tape, with punched holes at equal intervals & a spring loaded tension adjustment screw attachment. The punching of tape is done very accurately at 20 or 40mm interval to facilitate for easy setting of rough measurement and a fine & final adjustment is done with the help of adjustment nut or thumbnut. Fine adjustment closes the instrument and a spring loaded mark comes closer for alignment with a fixed mark on the window provided on instrument. This provides measurement data at fixed tension all the time. Two attachment hooks are provided, one at each end to fix on measurement points i.e. on eye bolt anchors or groutable anchors. Generally measurement points are groutable anchors but sometimes expandable anchors are also used.