Tra-Cards are for use with the Tracker to make up the Scratch-A-Track system to monitor the thermal movement of cracks and joints, building settlement, slab adjustments during jacking operations and a variety of other applications.
This simple device records movements as little as .005″ by leaving an indelible scratch as a permanent record. While some devices only tell you where the structure is at the time you are observing it, Scratch-A-Track tells you where it has been while you’ve been away.
You can leave the Scratch-A-Track Trac-Card in place in all types of weather for months at a time.
Tra-cards are sold in lots of 10 pcs.