Tinius Olsen's extensometers are designed to measure strain, the variation in length of a specimen divided by the specimen’s original length (gauge length). An extensometer measures strain by means of knife edges which contact the sample. This series of extensometer has strain gaged devices.
The models in this series of extensometer can be used to measure either transverse or longitudinal strain, or can be used in combination for defining Poisson’s ratio and ‘r’-value.
The main advantages of using strain gage type extensometers are given below:
- Can be left on specimen through failure
- Low operating force
- Lightweight to minimize any influence on the test
Rugged construction to withstand rigors of operation
SG Models - English Units
| Model |
Measuring Range |
Gage Length |
Direction |
| SG-20%-2 |
20% |
2 in |
Longitudinal |
| SG-20%-1.4 |
20% |
1.4 in |
Longitudinal |
| SG-20%-1 |
20% |
1 in |
Longitudinal |
| SG-20%-0.5 |
20% |
0.5 in |
Longitudinal |
| SG-50%-2 |
50% |
2 in |
Longitudinal |
| SGT-10%-1 |
+/- 0.1 in |
0 to 1 in |
Transverse |
SG Models - Metric Units
| Model |
Measuring Range |
Gage Length |
Direction |
| SGM-20%-50 |
20% |
50 mm |
Longitudinal |
| SGM-20%-25 |
20% |
25 mm |
Longitudinal |
| SGM-20%-80 |
20% |
80 mm |
Longitudinal |
| SGM-50%-80 |
50% |
80 mm |
Longitudinal |
| SGM-50%-50 |
50% |
50 mm |
Longitudinal |
| SGM-100%-50 |
100% |
50 mm |
Longitudinal |
| SGMT-10%-25 |
+/-2.5 mm |
0 - 25 mm |
Transverse |
Strain Gauge Type Extensometers for Longitudinal or Traverse Strain Measurement