Checkline TI-25S Ultrasonic Thickness Gauge

Price: $ 1,095.00
More flexible for users that have a need to measure more than one material type

Range: 0.025 - 19.99 inches - 0.63 - 199.99 mm

Resolution:0.001" (0.01 mm)
Datalogging: NO

The TI-25S Ultrasonic Thickness Gauge is ideal for the person that tests a few different materials regularly. The TI-25S Ultrasonic Thickness Gauge contains 8 velocities of the most common materials (refer to complete list of Materials below) and two velocities that the user can set using a simple software program

The tool's backlit display is easy to read, even in dim light, and the unit operates for up to 200 hours on a single set of batteries.

The TI-25S Ultrasonic Thickness Gauge comes complete, ready to use, and is protected by our 5 year limited warranty.

Velocity Settings

The TI-25S Ultrasonic Thickness Gauge has 8 preset velocities and 2 custom velocities allowing the user to customize it for specific applications, or to tune the calibration to be optimized for a specific type of material. Each time the "MATL Key" is pressed the velocity will toggle from one to the next in a circular pattern. The list of preset velocities are as follows:

  1. Aluminum 2024 (0.251 in/µs )
  2. Stainless Steel 303(0.223 in/µs )
  3. Steel4340 (0.233 in/µs)
  4. Cast Iron (0.179 in/µs )
  5. Plexiglass (0.106 in/µs )
  6. PVC (0.094 in/µs)
  7. Polystyrene (0.092 in/µs)
  8. Polyurethane (0.070 in/µs)
  9. Custom 1
  10. Custom 2

Note: If the Custom 1 & 2 are needed, they are set using the PC software (free) & downloaded to gauge using the data cable (optional, p/n N-306-0010)


  • Multi-function 4.5 digit liquid crystal display with 0.500 inch numerals, backlit for use in poor light conditions
  • Measurements displayed in inches, inches/microsecond, millimeters, and meters/second
  • Measures from 0.040 to 6.000 inches (1.00 to 150.0 millimeters) switch to select English or metric units
  • Four readings per second for single point measurements
  • 8 pre-set velocities and 2 custom velocities
  • Ability to change between velocities without the use of computer software

line10 User-Selected Material Typesline

Each time the "Matl" key is pressed, the material type (calibration setting of the acoustic velocity) changes from one type to the other. The abbreviations, description and sequence is shown below.

*Note: If the Custom 1 & 2 are needed, they are set using the PC software (free) & downloaded to gauge using the data cable (optional, p/n N-306-0010)

lineTypical Applicationsline


lineMeasuring Limitsline

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


Measuring Range0.040 to 6.000 inches
1.00 to 150.0 millimeters
depends on material and probe used
Range in Steel0.025-6.00" (0.60-150.0 mm)
Resolution.001" (0.01 mm)
Velocity Range.0492 to .3937 in/µs
1250 to 10,000 meters/sec
Dimensions2.5 W x 4.75 H x 1.25 D inches
Display4½ - Digit, 0.5" Backlit LCD
Probe1/4", 7.5 MHz, actual wearface is 3/8" (10 mm)
Probe P/N: T-102-3300
Cable4 ft. (1.2 m) waterproof cable with non-polarized, quick-disconnect connectors. Optional lengths up to 50 ft. (15 m).
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 1.5V alkaline or 1.2V NiCad AA cells.
Battery LifeTypically operates for 200 hours on alkaline and 130 hours on NiCad.
Weight10 ounces (283 g)
Accessories IncludedProbe/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

lineComplete Kitline

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

lineOptional Accessoriesline

NIST-Traceable Steel Test Block
3 Sizes Available

  • Precision Machined and Finished
  • Includes NIST Report and Test Data


Uncertified Steel Test Block
For Ultrasonic Gauges
  • For convenient confirmation of thickness gauge calibration


Protective Holder for Ultrasonic Gauge

  • Constructed from heavy duty Cordura Nylon
  • Built-in belt loop


Coupling Fluid

  • Used to create an ultrasonic coupling between the probe and material to be measured
  • 12 oz Bottle


Transducer Holder

  • The V-Block transducer holder offers the operator greater control and repeatabily when measuring on pipes and other curved areas



  • Free data acquisition software


Transfer Cable


Checkline TI-25S Ultrasonic Thickness Gauge - Probe Zero
Checkline TI-25S Ultrasonic Thickness Gauge - Data Sheet
TI-25S Ultrasonic Thickness Gauge - Instruction Manual

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