The Extech TKG100 Ultrasonic Thickness Gauge is a compact, handheld unit for non‑destructive thickness measurements of steel structures. Hold mode retains the last thickness reading with reverse video display. Freeze mode freezes the display, ideal for high temperature readings. The gauge beeps and flashes the display with keypad illumination.

Measurement range: 0.040–20 inches of steel with 5MHz probe (0.020–20in with optional 10MHz probe). Sunlight‑readable dot‑matrix display, multiple transducer support, on‑screen display in 8 languages, fast minimum feature to capture minimum thicknesses. Splash‑proof (IP54), high‑impact, compact housing. Battery life up to 50 hours (20 hours with backlight).

Applications include boiler tubes, pressure vessels, storage tanks, ship hulls, pipes, steam lines, compressors, shafts, bridge pins, and bond inspection.