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Displacement Transducers

Crackmeters (VW) | Model 4420

  • Model 4420 Crackmeter.
  • Model 4420 Crackmeter configured with special clamps for attachment to geogrids.
  • Three Model 4420 Crackmeters configured as a single 3-D Crackmeter.
  • Model 4000-6 Galvanized Steel Cover Plate (optional).
Model 4420

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, 300, 400, 500 mm
0.025% F.S.
±0.1% F.S.
<0.5% F.S.
Temperature Range¹
−20 °C to +80 °C
318, 343, 397, 555, 645 mm (transducer)
8 mm (shaft); 25 mm (coil)

¹Other ranges available on request.

²Accuracy established under laboratory conditions.

³Length dimensions are in mid-range position.

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.