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 gage to the anchors.

Specifications:
Standard Ranges¹ 12.5, 25, 50, 100, 150 mm 
Resolution  0.025% F.S. 
Accuracy ±0.1% F.S. 
Nonlinearity  <0.5% F.S. 
Temperature Range −20°C to +80°C 
Diameter  8 mm (shaft) / 25 mm (coil) 
Lengths² 325, 333, 379, 543, 685 mm (transducer)

Geokon, Incorporated, 48 Spencer Street, Lebanon, New Hampshire, 03766 · USA. Tel.: 1(603)448-1562, FAX: 1(603)448-3216, e-mail: info@geokon.com