WELDERS TESTING LAB. (PHILS.), INC., indisputably the most experienced NON-DESTRUCTIVE TESTING (NDT) company in structural steel, industrial facilities, oil refineries and power plants in the country today, moves toward a new millennium in the world of NDT as the industry's vanguard in high-tech utilizations, applications and innovations. WTL's testing services includes Radiographic, Ultrasonic, Magnetic Particle, Liquid Penetrant, Vacuum, Hardness, Holiday, and Stress Relieving.