Model 4420

Crackmeters (VW)

The Model 4420 Crackmeter is intended to measure movement across surface cracks and joints. It is installed by grouting, bolting, or bonding two threaded anchors (with ball joints) on opposite sides of the crack and then attaching the ends of the gauge to the anchors.


Standard Ranges¹: 12.5, 25, 50, 100, 150 mm
Resolution: 0.025% F.S.
Accuracy²: ±0.1% F.S.
Nonlinearity: <0.5% F.S.
Temperature Range¹: −20 °C to +80 °C
Lengths³: 318, 343, 397, 555, 645 mm (transducer)
Diameter: 8 mm (shaft); 25 mm (coil)

¹Other ranges available on request.

²Accuracy established under laboratory conditions.

³Length dimensions are in mid-range position.