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5 year warrantyMeasuring Range
0.040 - 6.00 inches
1.00 - 150.0 mm

The Check-Line TI-25LT Ultrasonic Steel Thickness Gauge accurately measures steel thickness and the extent of corrosion - from only one side!

Standard configuration: In its standard configuration, the TI-25LT is factory set to MEASURE STEEL ONLY

Optional configuration: As a “no cost” option, the TI-25LT can be factory set to measure on stainless steel.


  • Includes NIST-Traceable Calibration Certificate
  • Resolution of 0.002 inch (0.01 mm)
  • Large, backlit LCD display retains last reading
  • Simple operator controls virtually eliminate training
  • Special-purpose probes are offered for a variety of applications
  • The gauge is impact-resistant and environmentally sealed to provide trouble-free operation under the toughest field conditions
  • Switch-selected units for inches or mm
  • For underwater surveying, probe cable lengths up to 50 feet are optional
  • The TI-25LT probe is waterproof and can be submerged in water
  • CE Certified
  • Made in the USA with 5-Year Warranty
  • IP 65 Rated

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Complete Kit

Complete Kit includes: Gauge, probe, 4 oz. bottle of coupling fluid, 2 AA batteries, NIST-Traceable Calibration Certificate and Operating Instruction Manual - all in a foam-fitted carrying case.

Measuring Limits

Minimum Radius for Convex Surfaces 0.350" (8.89 mm)
Minimum Radius for Concave Surfaces 3" (76.2 mm)
Minimum Headroom 1" (25.0 mm)
Minimum Sample Diameter 0.150" (3.8 mm)
Minimum Substrate Thickness - F na
Minimum Substrate Thickness - NFe na


Range in Steel0.040-6.00" (1.00-150.0 mm)
Resolution.004" (0.01mm)
Display4½ - Digit, 0.5" Backlit LCD
Velocity Range.0787-.3937 in/µs
(2000-10,000 m/sec)
Probe1/4", 5 MHz, actual wearface is 5/8" (17mm)
Probe WearfacePEEK (Polyethylethylkytone)
Cable4ft. (1.2m) waterproof cable with non-polarized, quick-disconnect connectors. Op
Temp. LimitsAmbient: -20 to 120° F (-30 to 50° C)
Material: 0 to 200° F (-20 to 100° C) Special high temperature probes are optionally available
Battery TypeTwo AA batteries
Battery Life200 hours
Weight710 ounces (280g)
Dimensions2.5 x 4..5 x 1.25"
(64 x 114 x 32mm)
AccessoriesProbe/cable assembly, 4 oz. bottle of coupling fluid, NIST Calibration Certificate, 2 AA batteries, operating instructions, hard-plastic carrying case.
WarrantyGauge: 5 Years
Probes: 90 Days


Buy Now

Item Description Price
Replaced by TI-25LTX Steel Only Ultrasonic Thickness Gauge Kit with T-102-2000 Probe
Replaced by TI-25PX Stainless-Steel Only Ultrasonic Thickness Gauge Kit with T-102-2000 Probe
1/4" diameter, 5.00 MHz, dual element transducer (Standard Probe for TI-25LT)
Protective Holder for Most TI Series Gauges, F-112-0005
SoundSafe Coupling Fluid - 12 oz / 354 ml - NSN: 6635-01-553-0559
V-Block Transducer Holder (For 3/16" & 1/4" Transducers only), F-000-7001
4 Step Steel Test Block, 0.1 / 0.2 / 0.4 / 0.6 inch - Uncertified, supplied in plastic case
In stock
1 Week Lead Time (Estimated)
2-3 Week Lead Time (Estimated)
Lead Time Varies, Please contact us for availability.