It's the Same ASTM F959 DTI - Tension control rather than torque control. No splined end to twist off and become a safety hazard. FHWA pre-installation verification procedures, Research Council tests, and State DOT Quality Assurance procedures are unaffected. Even when the bolts are extremely short or long, squirters show you when the correct tension has been achieved. Some applications prefer bolts tightened over a minimum, but not too far over.
Squirters enable previously unavailable control.
Saves Erector Time - Enables correct tensioning as fast as the wrench can be moved to the next bolt, because the operator can see when to stop. Establishes A Good Snug Point - With squirters, snug is partial bolt tightness without the silicone showing. The snug criteria becomes no squirt. The tight criteria becomes squirt.