VW Rebar Strainmeter

VW Rebar Strainmeter

The Model 4911 Rebar Strainmeter is designed for measuring strains in foundations, slurry walls, precast piles, caissons, bridge abutments, tunnel liners, etc. The standard Model 4911 (#4 rebar), known as the “Sister Bar,” is installed alongside structural rebar. Larger models (4911A) are available for welding directly into structural rebar. Where short-term dynamic measurements are to be made, bonded resistance (Model 3911/3911A) strain gages can be substituted or added.

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Standard Range 3000 µε
Resolution 0.4 µε
Accuracy¹ ±0.25% F.S.
Nonlinearity <0.5% F.S.
Temperature Range² −20° to +80 °C
Rebar Sizes 4911 | 4 (Sister Bar)
4911A | 6, 7, 8, 9, 10, 11, 12
Active Gage Length 914 mm


¹ Other ranges available on request.
² Established under laboratory conditions.