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Strain Gauges

Spot Weldable · Miniature (VW) | Model 4100 · 4150 · 4151

  • Model 4150 (front) and Model 4100 Spot-Weldable Strain Gauges.
  • Model 4150 under the Model 4150-1 protective cover plate, with dimensions.
  • Model 4151 Strain Gauge mounted to a fiberglass rebar.
  • Dimensions of the Models 4100, 4150 and 4151 Strain Gauges.
  • Model 4100-WLD Stinger spot welder.
Model 4100 · 4150 · 4151

The Model 4100/4150 Strain Gauge has a 51 mm gauge length (3000 µε range, 1 µε sensitivity) and is designed to measure strains in steel structures (4100) and on reinforcement bars (4150) where space may be limited. The gauge is installed quickly and easily by means of a capacitive discharge spot welder or, for short-term use, with special epoxy adhesives; the latter method of attachment permits the use of this gauge on concrete.

The Model 4151 is a modification of the Model 4150 strain gauge in which the spot-weldable tabs have been replaced by pins welded to the end blocks and designed to be grouted into two short holes drilled into the material under test. Special versions of the Model 4151 are available with extended ranges. These gauges are particularly useful for measurements in high strain regimes such as on plastic pipes or piles and on fiberglass structural members and rebars. A unique design allows these gauges to be manufactured without increasing their overall length, making them particularly suitable where space and or access is limited.


Standard Range
4100, 4150, 4151 | 3,000 µε
4151-1 | 5,000 µε
4151-2 | 10,000 µε
4100, 4150, 4151 | 0.4 µε
4151-1 | 1.0 µε
4151-2 | 2.0 µε
±0.5% F.S.
<0.5% F.S.
Temperature Range²
−20°C to +80°C
Active Gauge Length
51 mm

¹±0.5% F.S. with standard batch calibration. ±0.1% F.S. with individual calibration. Accuracy established under laboratory conditions.

²Other ranges available on request.

Please Note: GEOKON maintains an ongoing policy of design review and reserves the right to amend products and specifications without notice. Various instruments are discontinued over time and replaced with new, updated models.