EDS-64U-D is a single point borehole extensometer which is preferred to use at the locations where access to the mouth of borehole is easily available. This borehole extensometer is suitable for a 50 mm borehole.
| Type | Mechanical |
| No. of points | 2-3 points; 76 mm borehole (EDS-63U/D) 4-6 points; 102 mm borehole (EDS-63U/D) Single point; 50 mm borehole (EDS-64U/D) |
| Extension rod | Stainless steel or fibre glass |
| Anchor | Groutable or packer |
