Everhard MM21031 - Standard Seam Test Tool / Seam Probe

Built for everyday quality checks, the MM21031 gives installers and inspectors a reliable way to verify single-ply weld integrity, locate skips or voids, and confirm corners and terminations. A radiused probe tip delivers clear tactile feedback without gouging the membrane, while the angled profile and comfortable handle keep your knuckles clear and your line-of-sight on the seam. It’s lightweight, durable, and ready to live in your pouch for every walkthrough.

Key Features

• Radiused, hardened-steel probe tip focuses feel while helping reduce puncture risk on TPO, PVC, and EPDM
• Angled/offset head for better leverage and visibility around laps, corners, and penetrations
• Rigid shank transmits “read” of the seam so voids and cold welds are easy to detect
• Grippy, ergonomic handle for confident control—even with gloves or in damp conditions
• Compact, lightweight form factor for all-day carry and fast spot checks
• Jobsite-tough construction with corrosion-resistant finish for long service life
• Optional belt/pouch carry to keep the tip protected between tests

Overall length: 7″. 

Hook extension: 3-1/4″ length with 1/4″ diameter hook. 

Probe/shaft material: Heat-treated steel extension/probe.

Handle: Hardwood / wood handle. 

Weight: ~0.156 lb (≈0.071 kg).

Package quantity: 12 per carton.

• Grip the hardwood handle firmly, keeping a steady hand.
• Align the hook tip at the start of the seam or welded joint.
• Slide or trace the hook along the seam to detect voids or weak welds.
• Use gentle, consistent pressure—do not force or gouge the membrane.
• Repeat the pass if needed to verify seam integrity.
• Wipe the hook clean of any debris or residue after inspection.
• Store the tester in a safe, dry place to protect the hook and handle.

Q: What is the MM21031 used for?
A: Quick, reliable inspection of single-ply roofing seams—verifying weld integrity, locating skips or voids, and checking corners and terminations on TPO, PVC, and EPDM.

Q: How is the tip designed to reduce membrane damage?
A: The heat-treated steel probe has rounded corners and an angled profile, so it delivers clear tactile feedback while helping reduce puncture risk. Use light, steady pressure and glide along the seam—don’t pry.

Q: What are the size, materials, and weight?
A: About 7″ overall length with a 3.25″ hook extension (0.25″ diameter); heat-treated steel probe/shaft; hardwood handle; approx. 0.156 lb (0.071 kg).

Q: Any usage and care tips?
A: Keep the tip smooth and clean, wipe dry after use, avoid prying or twisting, and store the tool dry. Periodically inspect the hook for burrs that could mar the membrane.