Everhard MM21090 - Inspector's Seam Test Tool / Seam Probe

Purpose-built for quick, reliable quality checks on single-ply roofing seams, the MM21090 helps you verify weld integrity, locate skips or cold welds, and confirm terminations and corners. A radiused probe tip concentrates feedback without gouging, while the angled profile and grippy handle give you leverage and line-of-sight in tight spots. It’s a lightweight, jobsite-tough tool you’ll keep on your belt for every inspection.

Key Features

• Radiused stainless-steel probe tip designed to probe seams effectively while reducing puncture risk
• Angled/offset head improves visibility and leverage around laps, corners, and penetrations
• Textured, non-slip handle for confident control—even with gloves or in damp conditions
• Enclosed, rigid shank transmits clear tactile feedback so you can “feel” voids and skips
• High-visibility handle and compact form factor for fast find-and-go on inspections
• Compatible with TPO, PVC, EPDM, and other single-ply membranes
• Protective belt sheath/cover for safe carry between test locations
• Durable, corrosion-resistant construction engineered for daily professional use
• Made in the USA quality consistent with Everhard’s roofing tool lineup

Overall length: 8″ 

Steel shaft: 4″

Handle: plastic. 

Probe/blade material: Heat-treated high-carbon steel with rounded corners; angled blade for knuckle clearance.

Handle style: Ergonomic, sure-grip plastic.

Weight: 0.175 lb (0.08 kg). 

Package qty: 10 per carton

 UPC: 095412210901.

• Grip the ergonomic handle firmly, keeping your hands clear of the membrane surface.
• Position the blade tip lightly onto the welded seam to test adhesion.
• Slide or trace the probe along the seam to detect voids or loose welds.
• Maintain contact but avoid applying excessive force that could damage the seam.
• Repeat pass(es) if needed to confirm seam integrity.
• After inspection, wipe the blade clean of debris or residue.
• Store the seam tester in a dry location where the blade will not be bent or dulled.

Q: What is the MM21090 used for?
A: Quick, reliable checks of single-ply roofing seams—verifying weld integrity, locating skips/voids, and confirming corners and terminations.

Q: How is the tip designed to avoid damaging the membrane?
A: The probe has rounded corners and an angled profile to focus feedback while reducing puncture risk. Use light, consistent pressure and glide along the seam rather than prying.

Q: What are the size, weight, and materials?
A: Approximately 8″ overall length with a 4″ steel shaft; heat-treated high-carbon steel probe; ergonomic plastic handle; about 0.175 lb (0.08 kg).

Q: Which membranes is it compatible with, and any care tips?
A: Suitable for TPO, PVC, and EPDM seams. Wipe clean after use, keep the tip smooth (no burrs), avoid using it as a pry tool, and store dry between inspections.