Ultrasonic Thickness Gauges

Wall Thickness Gauges Model TI-25, TI007, with data logging options and interchangeable probes

The new TI-25 Wall Thickness Gauge accurately measures wall thickness and the extent of corrosion of all metals, ceramics, glass and most rigid plastics - from only one side!
The TI-25 can be used in a Single Thickness Reading mode or in a Scan mode , where the probe is dragged over a large measuring area. The minimum thickness reading recorded during the "scan" will be displayed.
The TI-25 probe is waterproof and can be submerged in water. The gauge is impact-resistant and environmentally sealed to provide trouble-free operation under the toughest field conditions.


  • Wall thickness on hard materials including corrosion of tank walls, piping and hull plates
  • Inspection of metals including steel, cast iron (malleable, and spheroidal graphite), aluminium, copper, brass, titanium, sheet metal, storage tanks, ships, structures and piping systems.
  • Inspection of non-metals including glass, ceramics and hard plastics (except acrylic resin)
  • Direct readout of thickness inches or mm
  • Automatic subtraction of coating thickness mode (Echo to Echo mode) (MMX models)
  • Built in test plate
  • Calibrate for a wide range of rigid materials
  • Scan mode for surveying large areas
  • Data Logging option
  • Special probes for high temperature
  • Acoustic velocity table for common materials included

NIST calibration stepUltrasonic thickness gauges use sound wave to measure wall thickness. Different types of materials have different inherent acoustic velocities. ( sound travels at different speeds through different materials ).For example the acoustic velocity of steel is 0.2330 inches/microsecond and that of aluminum is 0.2500 inches/microsecond. The TI 25 can be set to any acoustic velocity depending on the material being measured. The instruction book includes a table of acoustic velocities for common materials. Even if you don't know the acoustic velocity or your material you can measure it with the TI25 provided you have a sample of material of known thickness to start with. Picture to the right shows a NIST certified calibration stepped block

Basic wall thickness gauge 
wall thickness gauge

The TI-25DL  incorporates a built-in memory for 1000 data points that can be separated into 10 separate "batches." The stored data can be downloaded to a serial printer or a personal computer. A Windows compatible data transfer program is included.
In addition to single and scan modes the TI-25DL also has a Differential mode which displays the difference ("+" or "-") from a set "nominal" value.

Specifications TI25 and TI25DL
Range* 0.025-6.00" (0.60-150.0 mm)
see specs for special probes below
Resolution .001" (0.01 mm) (.0001", 0.001mm for 007 type)
Display 4½ - Digit, 0.5" Backlit LCD
Velocity Range 6,500-33,000 ft./sec (2000-10,000 m/sec.)
Probe 7.5 MHz, 0.25" Diameter (6.35 mm) with rubber molded grip.
Wearface PEEK (Polyethlethylketone)
Cable 4 ft. (1.2 m) waterproof cable with non-polarized, quick-disconnect connectors. Optional lengths up to 50 ft. (15 m).
Test Block 0.250" (6.35 mm) steel plate built in to the front of housing.
Temp. Limits Ambient: -20 to 120° F (-30 to 50° C)
Material: --ll0 to 200° F (-20 to 100° C)
Special high temperature probes are optionally available.
Battery Type Two AA batteries
Battery Life 200 hours
Minimum headroom 1.3" ( 33mm)
Minimum Sample diameter 0.5 " (12.7 mm)
Minimum radius Convex - 0.5" (12.7 mm)
Concave - 2.5 " (63.5 mm)
Serial output RS232C (8, N, 1, user set baud rate)
Weight 100 ounces (280 g)
Size 2.5 x4.5 x 1.25"
(64 x 114 x 32 mm)
Accessories Included Probe/cable assembly. 4 oz. bottle of coupling fluid, NIST Calibration Certificate, 2 AA batteries, operating instructions, hard-plastic carrying case.
Warranty Gauge: 5 years
Probe: 90 days
Serial output RS232C data logging unit only (TI-25DL)


TI-25 KitThe TI-25DL is supplied as a complete kit with the gauge, probe, 4 oz. bottle of coupling fluid, 2 AA batteries, NIST Calibration Certificate, data transfer software, serial output cable and Operating Instruction Manual - all in a foam-fitted carrying case.

Standard Kit TI-25 $1495.00
With Data Logger   $1795.00

Ordering Information You can order these products on line    Add item to shopping cart
Model Thickness
range inches
range mm
Price US$ 
TI-25M Standard 0.025 -6.000 inches 0.60 - 150 mm $1,550.00
TI-25M-H High Temp 0.060 -20.000 inches 1.5 - 490 mm $1,595.00
TI-25M-107 Cast Iron/Plastics 0.25 -6.000 inches 0.60 - 150 mm $1,495.00
TI-25M-107-High Temp 0.25 -6.000 inches 0.60 - 150 mm $1695.00
TI-25M-WOP without probe   $1495.00
TI-25M-102 general purpose 0.040- 1.0mm $1200.00
TI-25M-UWM Underwater gauge     $2790.00
TI-25S Selectable wall thickness gauge 8 preset; 2 custom calibrations   $1095.00
TI-25M-2120 Engine Blocks     $1,195.00
TI-25M-PR8 cylinder wall/engine blocks     $1,195.00
TI-25M-HW heavy wall     1,595.00
TI-007 High Res (0.0001") 0.0060 - 1.0000 inches 0.15 - 25.4 mm $1,995.00
TI-007 GT for plastics (0.0001") 0.0060 - 1.0000 inches 0.15 - 25.4 mm $1,995.00
Data Logging Gauges      
TI-25DL logger 0.025 -6.000 inches 0.60 - 150 mm $1,750.00
TI-25DL-H High temperature (up to 650F, 343C) 0.060 -20.000 inches 150 - 490 mm $1,995.00
TI-25DL-107 cast iron - plastics l 0.025 -6.000 inches 0.60 - 150 mm $1,995.00
TI-007DL  high resolution 0.0060 - 1.0000 inches 0.15 - 25.4 mm> $2,295.00
TI-007GT DL  high resolution for plastics 0.0060 - 1.0000 inches 0.15 - 25.4 mm $2,345.00
P25-DL Printer for TI25 logger $365.00
CF12 Coupling fluid 12 ozs $15.00
SB-4H 4 step calibration block 0.250/0.500/0.750/1.00 " $380.00
SB-4L 4 step calibration block 0.040/0.060/0.080/0.100 " $555.00
NISTCAL Calibration certificate $100.00
V Block Transducer holder for small pipes $185.00
T1CC-P Protective holder for TI-25 $75.00
TICC-M> Protective holder for TI-25DL/TO-007 $75.00
Spare Probes
T-102-3300 Standard probe $320.00
T-044-2000 High Temperature (up to 650F, 343C) $370.00
T-104-0000 Porous materials $295.00
T-104-1000 For Plastic > 0.25" $295.00
TI25-UW-50 50 ft water proof underwater probe $605.00
T-104-2000 Heavy wall $275.00
T-102-2000   $295.00
T-402-5507 High resolution $515.00