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Measuring Range in Steel
0.040 - 6.000 inches
1.00 - 150.0 mm

The CHECK-LINE TI-25P Wall Thickness Gauge accurately measures wall thickness and the extent of corrosion from only one side!

The TI-25P holds a single ultrasonic velocity, making it the perfect choice applications where only one material is being tested day after day. With the preset velocity in the gauge, you simply turn it on and go to work.

Standard configuration: In its standard configuration, the TI-25P is factory set to measure steel.

Optional configuration: When required the TI-25P can be programmed to measure any other single material instead of steel. In order to program the gauge for use on any other material then factory steel, a sample of the material to be measured is required or the exact sound velocity of the material must be known.


  • Resolution of 0.001 inch (0.01 mm)
  • The TI-25P probe is waterproof and can be submerged in water
  • Special-purpose probes are offered for a variety of applications
  • Switch-selected units for inches or mm
  • The gauge is impact-resistant and environmentally sealed to provide trouble-free operation under the toughest field conditions
  • For underwater surveying, probe cable lengths up to 15 meter are optionally
  • Large, backlit LCD display retains last reading
  • Comes complete with cable and software to transfer the velocity to the gauge.
  • IP 65 Rated

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Software for Thickness Gauges

Complete Kit

The TI-25P is supplied as a complete kit with the 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.

For setting the ultrasonic velocity, a connection cable and software are supplied

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 Steel0.040-6.000" (1.00-150.0 mm) with supplied probe. Other probes available.
Resolution0.01 millimeter (0.001 inch)
Display4½ - Digit, 0.5" Backlit LCD
Velocity Range0.0492 to .3937 in/μs. 1250 to 10,000 meters/sec
Probe1/4", 5 MHz, actual wearface is 5/8" (17mm)
Probe WearfacePEEK (Polyethylethylkytone)
Cable1.2m (4ft.) waterproof cable with non-polarized, quick-disconnect connectors
Temp. LimitsAmbient: -30 to 50° C (-20 to 120° F)
Material: -20 to 100° C (0 to 200° F)
Special high temperature probes are optionally available
Battery TypeTwo AA batteries
Battery Life200 hours
Weight280 g (710 ounces)
Dimensions64 x 114 x 32mm (2.5 x 4.5 x 1.25")
AccessoriesProbe/cable assembly, 4 oz. bottle of coupling fluid, NIST Calibration Certificate, 2 AA batteries, operating instructions, hard-plastic carrying case.
SoftwareComes complete with cable and software to transfer the velocity to the gauge.
WarrantyGauge: 5 Years
Probes: 90 Days


Buy Now

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Coupling Fluid - 12 oz / 354 ml
V-Block Transducer Holder (For 3/16" & 1/4" Transducers only), F-000-7001
1/4" diameter, 5.0 MHz, dual element transducer, Side In, Potted
4-pack AA Ni-MH Rechargeable Batteries & Charger Kit
In stock
1 Week Lead Time (Estimated)
2-3 Week Lead Time (Estimated)
Lead Time Varies, Please contact us for availability.