Economy Crack Comparator

Model: HM-639
Price: $4.00

HM-639 Economy Crack Comparator measures crack widths of concrete used in roads, pavements, bridges and other structures. This credit card-sized device is inexpensive, fits in a pocket, and can monitor cracks from 0.1 to 7.0mm (0.004 to 0.26in). Marked in inch and metric measurements. View our full line of Concrete Crack Monitors.


  • Good for field use
  • Measures in inch and metric

Included Items:

  • HM-369 Economy Crack Comparator
Estimated Shipping Weight 1.0lb (0.45kg)

Enter your name, email, and questions below and we will reply during business hours (8am - 5pm EST, Monday through Friday).

Estimated Shipping Weight 1.0lb (0.45kg)
Customers who purchased this item also purchased
Standard Crack Monitor
Model: HM-637
Crack Monitor Plus
Model: HM-634
Corner Adapter
Model: HM-635
Crack Width Gauge
Model: HM-636
Tamping Rods
Starting at $7.00
Models: HM-48A, HM-48, HM-47, HM-63
Concrete Cylinder Transport Racks
Models: HM-114, HM-116
2-Part Epoxy Adhesive
Model: HMA-804
Displacement Monitor
Model: HM-638