160 mm x 40 mm TOTAL Measurement Range


Cracks | Fissures | Expansion Joints

The new BUILDERA CRACKMON® XL 15040A Crack, Fissure and Expansion-Joint Monitor is a large-format differential-displacement scientific instrument for measurements of extra-wide cracks, fissures, and expansion joints. A massive -55 to +105 mm measurement range with a unique offset scale supports a peak-to-peak differential motion displacement of 160 mm on the X (horizontal) axis and 40 mm on the Y (vertical) axis. This is more than three-to-four times the measurement range of classic crack monitoring devices.


  • Applications requiring wide dynamic range

  • Bridges, culverts, highways, transportation infrastructure

  • Compromised concrete structures

  • Expansion-joint displacement vs. temperature/RH%

  • Insurance-risk assessment

  • Mining/geological fissure crack monitoring

  • Seismic-event forensic analysis

  • Sinkhole structural monitoring

  • Unreinforced masonry buildings (URM/URB)

  • Utilities/energy

CRACKMON XL 15040A measuring expansion-joint expansion and contraction vs. time and temperature

CRACKMON XL 15040A measuring expansion-joint expansion and contraction vs. time and temperature

Features and Benefits

  • Extreme Measurement Range: 150 mm (X) and 40 mm (Y)

  • Rugged: Heavy-duty, crystal-clear polymer will not yellow

  • High Measurement Accuracy: Brilliant color measurement grid includes Buildera's innovative polar magnitude and X-Y displacement with precision TickPoints™ to improve visual measurement accuracy

  • Engineering Traceability: Unique serial IDs yield unprecedented engineering traceability in a crack monitor

  • GEOQR™ Technology: Scan for online instructions, ordering, and geolocation tagging

  • VARICORNER™ Corner Mounting: Optional custom-formed corner-mounting adapters support any required corner mounting angle

  • Secure TAMPERLOK™ Installation: Exclusive Epoxy-Grip™ Technology assures ultra-strong bonding to substrate when mounting with epoxy

  • Co-branding Program: Custom branding options available—consult Buildera for program details

Detailed Description

Cartesian X-Y and Polar Measurements
The BUILDERA CRACKMON XL 15040A includes an improved measurement grid first introduced in the original BUILDERA CRACKMON 4020A. The new polar-magnitude measurement function computes the angular hypotenuse (magnitude) of change from the zero-crossing. That's why we call it 2D+.

Exclusive TickPoints
To improve reading accuracy over the entire range, the measurement grid includes Buildera's patented TickPoints™ at 1 x 1 mm intervals. TickPoints improve measurement accuracy as the measurement cross-hairs traverse the grid. This is particularly helpful when the two plates are no longer parallel.

CRACKMON® XL 15040A TickPoints and tri-color Measurement grid improves measurement accuracy across entire 150 x 40 mm range

CRACKMON® XL 15040A TickPoints and tri-color Measurement grid improves measurement accuracy across entire 150 x 40 mm range

Vibrant, High-Contrast Measurement Grid
For  ultimate readability, we print the new BUILDERA CRACKMON XL 15040A in five process colors, including a high-contrast rich-black text, UV-cured over a thick double layer of brilliant opaque white ink. The result is a bright, bold measurement grid with a 2X contrast improvement that's much easier to read over a wide range of lighting conditions. 

Engineering Traceability to the Crack
To improve engineering traceability, each crack monitor features a 15-character serial number that tracks the country of origin, design revision, and unique ID. This ensures engineering traceability in the field and offers a significant benefit and professionalism in forensic analysis.

BUILDERA GEOQR™ Mobile Installation Instructions and Tips
To put information at your fingertips, an imprinted QR code works with your mobile phone to access installation instructions and other helpful data, wherever you may be. Automatically retrieve product specifications and reorder using your mobile phone.

Flexible, Tamper-Resistant Mounting Options
Improved mounting options now include both horizontal and vertical slots, optimally sized to accept M5 fasteners. Optionally available is a stainless-steel Torx-Plus® tamper-resistant mounting kit and anchors. To avoid damaging the crack monitor, Buildera also supplies corrosion-resistant stainless-steel washers to help distribute the load for a secure installation.

Available in Bulk for Distributors and High-Volume End Users
The BUILDERA CRACKMON XL 15040A is available singly or in bulk packs for distributors, resellers, and volume end-users.

Customizable with Co-Branded Options
BUILDERA welcomes the opportunity to customize crack monitors with your logo and website. We can even customize the QR code to redirect to your website for re-ordering. Consult BUILDERA for special requests and other options.

Ordering Information

UPC 816291010440
EAN 0816291010440

BUILDERA CRACKMON® XL 15040A (5-Pack per Carton)
UPC 816291010471
EAN 0816291010471

Installation Instructions | BUILDERA CRACKMON XL 15040A


  • $149/each (Order via

  • $599/5-Pack wholesale from BUILDERA

Individual units sealed in a heavy-duty polybag packed inside a 3"x18" shipping tube. Includes installation instructions, heavy-duty stainless-steel fasteners, and crack progress chart. Epoxy sold separately. Available also in bulk for resellers and volume end-users. Contact BUILDERA using the online form below for volume pricing.

Name *
Please include information about your application for wide measurement ranges.


Specifications subject to change


Dual Range (includes ±5 mm X-Axis Over-range)
-55 to +105 mm (X), ±20 mm (Y) (standard range)
-5 to +155 mm (X), ±20 mm (Y) (offset range)

Visual Discrimination
±0.5 mm, typ.

Engineering Traceability
Unique 15-digital serial number

Fastener Mounting Holes
(4) Per side
Horizontal slots (2) 22 mm (wide) x 6 mm (tall)
Vertical slots (2) 6 mm (wide) x 22 mm (tall)
Hole spacing 40 mm on center (per side)

Recommended Fasteners
Button-head security sheet-metal screw, stainless steel (18-8 alloy) and compression washers
Note: the use of washers during mounting is essential to securing the crack monitor and to distribute load across the mounting surface area. Tighten by hand. Do not over-torque.

Epoxy Mounting Holes
(9) Per side: dia 3 mm x 9 places per side
Buildera TAMPERLOK™ Epoxy-Grip Technology

451 mm x 64 mm x 11 mm (17.8" x 2.5" x 0.43")
Dimensions relative to 0-0 (X-Y) starting position

Assembled Weight
325 grams (11.5 oz)

Country of Origin (CoO)
Engineered and made in the USA of premium materials


5.5 mm (0.220") proprietary acrylic polymer

Tensile Strength
11,000 psi (ASTM D-638)

Flexural Strength
117 MPa (17,000 psi), ASTM D-790

Tensile Impact Strength
20 ft-lb/in^2

Rockwell Hardness
M-95  (ASTM D-758)

Specific Gravity / Relative Density

Light Transmission-Total

Water Absorption
0.4% by weight (ASTM D-570)


Thermal Expansion (ASTM D696, -30C to +30C)
54 µm/(m-°C), 30 µin/(in-°F )

Maximum Recommended Continuous Service Temperature
< 85°C (185°F)

Deflection Temperature @ 264 psi (1.8 MPa)
95°C (203°F)

Melting Temperature
150°C (300°F)

Self Ignition Temperature
445°C (833°F)


Flame Spread Index
115 (ASTM E-84)

Smoke Density Rating
3.4% (ASTM D-2843)


EAN 0816291010006
UPC 816291010006

The 3-pack kit includes three (3) BUILDERA CRACKMON® 4020A Crack Monitors and (1) 5-minute structural thixotropic epoxy. Includes installation instructions and crack progress chart.

BUILDERA CRACKMON® 4020A (18-Pack ContractorPak)
EAN 0816291010013
UPC 816291010013

Ideal for contractors, structural engineering firms and volume end-users, this 18-pack kit includes three (18) BUILDERA CRACKMON® 4020A Crack Monitors and three (3) dual syringes of 5-minute structural thixotropic epoxy. Includes installation instructions, crack progress chart and one (1) bonus CRACKMON® 224R Crack-Width Comparator.

EAN 0816291010099
UPC 816291010099

Premium structural mounting epoxy engineered for superior crack monitor installation to concrete, masonry, stucco, drywall, steel, wood, and other materials.