RTT Door Gap Tool

Dev’s RTT Door Gap Tool is a compact, precision gauge for quickly checking door gaps and latch throw distances in the field. Redesigned for practicality and portability, this small, durable tool gives technicians, inspectors, and penetration testers the ability to verify clearances to NFPA-80 tolerances or measure gap sizes discreetly while working on-site. Its slim profile and keychain-ready hole make it easy to carry on a lanyard or attached to a tool ring.

Key Details & Benefits

• Compact & Portable: Slim, pocketable design with a keychain/lanyard hole so it’s always at hand.

• Precision Measurement Surfaces: Clearly cut measuring edges for quick verification of gap and latch throw sizes.

• Durable Construction: Made from sturdy, wear-resistant material suitable for repeated field use.

• Field-Friendly: Ideal for fire door inspectors, installers, maintenance techs, and security professionals performing entry assessments or penetration testing.

• Discreet & Practical: Small footprint for covert carry during authorized security assessments or convenient use during routine inspections.

Measurements Included

• 1/16"

• 1/8"

• 3/16"

• 3/8"

• 1/2"

• 3/4"

Technical Notes

• Material: Durable polymer or plated metal (model dependent)

• Size: Slim profile for pocket or keychain carry

• Applications: Door gap verification, latch throw measurement, NFPA-80 inspections, on-site fit checks, and tactical assessments (use only on property you own or are authorized to inspect)