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has a fixed velocity of .2330 in/μs. / 5920 meters/sec
which is the speed sound travels through common steel.
It can’t be adjusted for any other materials other than steel.

TI-25MXT Thru-Paint Ultrasonic Wall Thickness Gauge

  The new CHECK-LINE TI-25MXT Wall Thickness Gauge accurately measures wall thickness and the extent of corrosion of all metals, ceramics, glass and most rigid plastics from one side. When operated in E-E Mode (Thru-Paint Mode), the coating is eliminated from the reading and the gauge will display only the thickness of the metal wall.

  TI-25MXT Features include Automatic or Manual Probe Zero maximizing accuracy, 5-position Gain Adjustment to help located the correct backwall echo and to penetrate the walls on sound-attenuating materials such as cast metals and thick materials. It also features Differential mode, Hi-Low Alarms with audible and visual indicators and Scan mode that captures the minimum thickness at 100 measurements per second (100 Hz). It also includes a special Velocity Mode to measure in terms of velocity for nodularity testing.

   The gauge and probe have a protection rating of IP67, is impact-resistant and environmentally sealed to provide trouble-free operation under the toughest field conditions The TI-25MXT can be used with any of the following hi-damped dual-element transducers specifically designed for use with E-E Thru-Paint Mode.

Measuring Range on Steel (with standard T-102-2700 probe)

Pulse-Echo (PE) Mode (Pit & Flaw Detection) – 0.040 to 8.00 inches / 1.00 to 199.9mm
Echo-Echo (EE) Mode (Through Paint & Coatings) – 0.100 to 1.000 inch / 2.54 to 25.40 mm

Total Measuring Range (Probe Dependant)
Pulse-Echo (PE) Mode (Pit & Flaw Detection) – 0.025 to 36.000 inches / 0.63 to 914.4 mm
Echo-Echo (EE) Mode (Through Paint & Coatings) – 0.100 to 1.000 inch / 2.54 to 25.40 mm


    • Includes NIST Traceable Calibration Certificate
    • Includes both Pulse-Echo Mode (Pit & Flaw Detection) and Echo-Echo Mode (Through Paint & Coatings Mode)
    • Using the standard probe T-102-2700, the gauge will read thru 0.040″ coating thickness (1 mm)
    • Using one of the optional probes T-104-2700, the gauge will read thru 0.075″ coating thickness (1.9 mm)
    • Calibrate to a sample of known thickness which automatically calculates the optimal acoustic velocity
    • 2-Point Calibration to optimize linearity over a wide measurement range, automatically calculates the optimal acoustic velocity
    • Scan mode, 100 readings/sec. Probe is slid over a large measuring area, the minimum thickness during the “scan” will be displayed
    • Adjustable GAIN in 5 steps to fine tune the gauge for use on challenging materials or applications
    • Differential mode, Hi-Low Alarms with audible and visual indicators
    • User-selected Manual or Auto Zero of Transducer
    • The extruded aluminum housing is impact-resistant and environmentally sealed (IP 65)
      to provide trouble-free operation under the toughest field conditions
    • Special-purpose probes are offered for a variety of applications (1 to 10 MHz)
    • Selectable Backlight ON/OFF/AUTO
    • Resolution of 0.001 inch (0.01 mm)

Measuring Limits

Minimum Radius for Convex Surfaces0.350″ (8.89 mm)
Minimum Radius for Concave Surfaces3″ (76.2 mm)
Minimum Headroom1″ (25.0 mm)
Minimum Sample Diameter0.150″ (3.8 mm)
Minimum Substrate Thickness – Fna
Minimum Substrate Thickness – NFena


Range in SteelPulse-Echo Mode (Pit & Flaw Detection) measures from 0.025 to 19.999 inches
(0.63 to 500 millimeters)
Echo-Echo Mode (Through Paint & Coatings) measures from 0.100 to 1.000 inch
(2.54 to 25.40 millimeters)
(range depends upon probe selected) – five probes to choose from
Resolution0.001 inch (0.01 mm)
Velocity Range0.0120 to .7300 in/μs. 305 to 18,542 meters/sec
Probe (Standard)1/4″, 5 MHz Hi-Damp Dual Element Transducer, actual wearface is 5/8″ (17mm), p/n T-102-2700
Probes (optional)1 to 10 MHz, 3/16″ up to 1 inch (custom probes available)
Probe WearfacePEEK (Polyethylethylkytone)
Cable1.2m (4ft.) waterproof cable with non-polarized, quick-disconnect connectors
LCD DisplayMulti-function 7 segment 4.5 digit liquid crystal display with 0.500″ digit height. Two 0.125 in14 segment fields for labels and values, and one 7 segment field for labels and values. Additional icons to indicate features and modes
Display BacklightBacklight is selectable on/off/auto, and selectable brightness (Lo, Med, Hi) options
Display Update Rate10 Hz (10 updates/sec)
Temp. LimitsAmbient: -30 to 75° C (-22 to 167° F)
Material: -20 to 100° C (0 to 200° F)
High temperature probes available
Battery Type2x AA batteries (rechargeable batteries can be used)
Battery Life45 hours continuous use
Weight308 grams (11 ounces)
Dimensions63.5 x 131.3 x 31.5 mm (2.5″ x 5.17″ x 1.25″)
AccessoriesProbe/cable assembly, 4 oz. bottle of coupling fluid, NIST Calibration Certificate, 2 AA batteries, operating instructions, hard-plastic carrying case.
HousingExtruded aluminum body with nickel-plated aluminum end caps (gasket sealed)
Housing RatingIP65
CertificationsNIST Traceable and MIL-STD-45662A
KeypadSealed membrane that is resistant to both water and petroleum products
Seven or eight tactile-feedback keys
Pulse Repetition Frequency (PRF)200 Hz (200 pulses/sec)
To Lock SettingsWith gauge powered off, press and hold the “+” key while powering on the gauge
The LOCK icon will be illuminated on the Display
To unLock SettingsWith gauge powered off, press and hold the “-” key while powering on the gauge
The LOCK icon will turn off
GAIN AdjustmentAdjustable GAIN 5-position (VLOW, LOW, MED, HIGH, VHI), in 3dB steps, 40-52dB
Time Dependent Gain (TDG)Used in both pulse-echo (P-E) and Echo-Echo (E-E) modes depending on transducer and frequency selected
Measuring ModePulse-Echo (P-E), Echo-Echo (E-E, Thru-Paint Mode), Scan, Differential, Alarm and VX-velocity
Pulser150 volt square wave pulser

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