As An Essential Business, Checkline Will Remain Open To Support Critical Infrastructure And Manufacturing Industries During The COVID-19 Pandemic
Click images to enlarge.
The TI-25S is ideal for the person that tests a few different materials regularly. The TI-25S 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 comes complete, ready to use, and is protected by our 5 year limited warranty.

5 year warrantyVelocity Settings
The TI-25S 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 0.025 to 6.000 inches (0.60 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
  • IP 65 Rated

10 User-Selected Material Types

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)

Complete Kit

The TI-25S is supplied as a complete kit with the gauge, probe, 4 oz. bottle of coupling fluid, 2 AA batteries, PC-based Software, 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

Related Products

Certified Steel Test Blocks
Click image for more info
Certified Steel Test Blocks
- Includes NIST Traceable Calibration Cert
- Precision Machined and Finished
- Includes Wooden Storage Box
SB4 & SB6 Uncertified Steel Test Blocks
Click image for more info
Ultrasonic Test Blocks without certification
- Fabricated from 1018 Steel or 304 Stainless Steel
- ISO Calibration OPTIONAL
TICC-M Protective Holder for Most TI Series Gauges, F-112-0005
Click image for more info
Protective Holder for Ultrasonic Gauges
- Constructed from heavy duty Cordura Nylon
- Built-in belt loop
CF12 Sound Safe Ultrasonic Couplant
Click image for more info
Coupling Fluid
- Temp Range: 0 - 200 °F, -18 - 93 °C
ultrasonic trandsducer holder v-block
Click image for more info
Ultrasonic Transducer Holder
Click image for more info
Software for Thickness Gauges
Click image for more info
6 foot RS232 Cable (DB-9 to Lemo 2 pin)


Range in Steel0.025-6.00" (0.60-150.0 mm) Will vary in other materials
Resolution.001" (0.01 mm)
Velocity Range0.0492 to .3937 in/μs. 1250 to 10,000 meters/sec
Dimensions 2.5 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


Buy Now

Item Description Price
Replaced by TI-25SX Ultrasonic Thickness Gauge Kit with T-102-3300 Probe
Protective Holder for Most TI Series Gauges, F-112-0005
Coupling Fluid - 12 oz / 354 ml
V-Block Transducer Holder (For 3/16" & 1/4" Transducers only), F-000-7001
1/4" diameter, 7.5 MHz, dual element transducer (Standard Probe for TI-25S)
4-pack 2300mAh AA Ni-MH Rechargeable Batteries & Charger Kit
PC Program to download Custom #1 & Custom #2 calibrations to TI-25S (N-306-0010 cable must be ordered)
6 foot RS232 Cable (DB-9 to Lemo 2 pin)
USB to Serial Adapter
In stock
1 Week Lead Time (Estimated)
2-3 Week Lead Time (Estimated)
Lead Time Varies, Please contact us for availability.