MiniTest 406 Ultrasonic Wall Thickness Gauge

Ultrasonic Wall Thickness Gauge
Click images to enlarge.
The MiniTest 406 is a simple to use hand-held Ultrasonic Thickness Gauge with the ability to measure through paint and coatings and eliminate the thickness of the paint or coating. The 406 uses a dual element style transducer. With the single press of a button, the 406 can be switched between pit or flaw mode ( pulse-echo), and through paint/coatings mode (echo-echo) for maximum inspection efficiency. The 406 is equipped with advanced features to make your job easer: Alarm mode, high speed scanning, and data send are the main features of the 406.


  • Resolution of 0.0001 inch (0.001 mm)
  • Selectable units of inch or mm
  • Memory for 1000 data points in up to 10 batches
  • RS-232C Serial output for downloading stored data to a printer or computer
  • Windows compatible data transfer program supplied at no additional cost.
  • Large, backlit LCD display retains last reading
  • CE Certified
  • Includes NIST-Traceable Calibration Certificate
  • IP 65 Rated

Delay Line Tips for 406

P/N Description Standard / Optional Image
X-231-0000 1/4" x 3/8"
for all metals
X-241-0000 1/4" x 1/2"
for all metals
X-633-0000 1/4" x 3/8"
Graphite Tip
for thin plastics
(Graphite Short)
Standard on "-GT" models

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Measuring Range:0.04'...19.99' depending on material
Range in Steel0.0060-1.0000" (0.15-25.40 mm)
Resolution.0001" (0.001 mm)
Display4½ - Digit, 0.5" Backlit LCD
Velocity Range0.0492 to .3937 in/μs. 1250 to 10,000 meters/sec
TransducerSingle element with delay tip. 10 to 22 MHz frequency range.
Probe WearfacePEEK (Polyethlethylketone)
Cable4 ft. (1.2 m) waterproof cable with non-polarized, quick-disconnect LEMO connectors. Optional lengths up to 100 ft. (30 m)
Serial OutputRS-232C (8, N, 1, user-set baud rate)
Temp. LimitsAmbient: -20 to 120° F (-30 to 50° C)
Material: 0 to 200° F (-20 to 100° C)
Battery TypeTwo AA batteries
Battery Life150 hours
Weight7 ounces (300g)
Size2.5 x 4.5 x 1.25"
(64 x 114 x 32 mm)
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
Security Lock ModeHold down the DOWN ARROW Key as you power th gauge on. The "LOC" function with toggle on/off

Buy Now

Item Description Price
MiniTest 406 Ultrasonic Gauge, complete kit with with T-402-5507 probe - Please contact us for pricing and availability.
1/4" diameter, 15 MHz delay line transducer with cable, 1/2" and 3/8" length delay line tips
1/4" x 3/8" Length Delay Line - OLD PN X-231-0000
1/4" Diameter x 1/2" Length Delay Line Tip - OLD PN X-241-0000
1/4" Diameter x 3/8" Length Graphite Tip Delay Line
LEMO 00 - Microdot Single Probe Transducer Cable, 4 foot length
In stock
1 Week Lead Time (Estimated)
2-3 Week Lead Time (Estimated)
Lead Time Varies, Please contact us for availability.