Wall thickness gauge SA40

Combination gauge for non-destructive ultrasonic thickness measurement

The SA40 is a small and handy ultrasonic wall thickness gauge. The smart instrument is capable of measuring the wall thickness of a great variety of metallic and nonmetallic materials e.g.: iron, steel, aluminum, brass, copper, lead, magnesium, nickel, titan, zinc, beryllium, molybdenum, quartz glass, acrylic glass, nylon, polyethylene, polystyrene, silicon and many more. The usage of different probes ensures perfect flexibility at different circumstances for instance when measurements have to be taken at hardly accessible spots or under extreme temperatures.

Through the usage of wall thickness gauges’ materials which are exposed to corrosion or erosion can be controlled and thus, their safe usage is guaranteed. 


  • Light, handy and safe in operating
  • Large display-screen with automatic lighting
  • High accuracy even in residual wall thicknesses
  • 4 different probes are available: standard, miniature, high-temperature and cast-iron-testing tip with a 88cm connection cable
  • Fast testing tip change by plug-in contacts
  • Ultrasonic manually adjustable up to max. 9,999 m/s. Allows measurements on a large variety of materials (see velocities)
  • Speed ​​measurement with known wall thicknesses
  • Memory holds 40 measurement results
  • Units: mm or inch
  • Simple calibration with integrated measuring plate
  • Battery indicator


  • Steel plates
  • Finishing parts
  • Tubes
  • Pressure vessels
  • For example in: the petroleum, chemical, metal, shipbuilding, and aerospace industry
Wall thickness gauge SA40

Standard delivery range

  • SA 40
  • Standard sensor PT-5
  • Couplant
  • 1.5V Batteries
  • Instructions manual
  • Case

Optional accessory

  • Other sensors (selection in "Sensors")


All SaluTron® gauges correspond to national (DIN) and international (ISO, BS, ASTM) norms and possess the CE-sign.
Specifications are subject to change without prior notice.

Technology Measurement of first echo with transmit-receive sensor
Display 4 digit LCD with backlight
Measuring range 0.8 – 225 mm, depending on test material and chosen sensor
Accuracy Adjustable ± 0.01 mm
Memory capacity 40 storage places
Resolution 0.01 mm in the range of 0.8 – 99.99 mm
0.1 mm in the range of 0.1 – 225 mm
Ultrasonic velocity 500 – 9.999 m/sec.
Coupling On the display
Unit mm or inch
Battery capacity indication On the display
Automatic shut down After 5 minutes non-use
Working temperature 0 - 40°C
Relative humidity 20 - 90%
Power supply 2 pieces 1.5V AA batteries
Size 124 x 67 x 30 mm
Weight 240 g

Sensors for SA40

Sensor Application Measuring range Surface temperature
of work piece
Frequency Diameter contact area Sensor form
Wall thickness gauge SA40 - Sensor PT-5
Standard Sensor suitable for steel, non-ferrous metals, aluminum with its alloys, synthetics, ceramics, glass. 0.8 to 225 mm
in steel
-10°C to +50°C 5 MHz 10 mm direct
Wall thickness gauge SA40 - Sensor GT-5
High Temperature Sensor suitable for steel, non-ferrous metals, aluminum with its alloys, synthetics, ceramics, glass. 2.5 to 200mm
in steel
-10°C to +400°C 5 MHz 12 mm direct
Wall thickness gauge SA40 - Sensor XT-5
Special Miniature Sensor for measurements on small pipes, curved material, edges, small contact areas and where the area of accessibility is limited, on same material as PT-5 1 to 30 mm
in steel
0°C to +50°C 5 MHz 7 mm Right-angled
Wall thickness gauge SA40 - Sensor CT-2,5
Cast Iron Sensor for measurements on material with high signal attenuation such as cast-iron and synthetics. 3 to 225 mm
in steel
-10°C to +50°C 2.5 MHz 12 mm Right-angled

Velocities at different materials

Material V (IN / m/s) V (m/s)
Aluminium; rolled 0,2530 6,420
Aluminium; 6061-T6 0,2510 6,383
Beryllium 0,5073 12,89
Brass, 70 CU, 30 Zn 0,1850 4,700
Copper; rolled 0,1972 5,010
Duraluminium 0,2487 6,320
Iron 0,2345 5,960
Lead; rolled 0,0771 1,960
Magnesium 0,2270 5,770
Molybdenum 0,2470 6,250
Monel 0,2105 5,350
Nickel 0,2377 6,040
Steel; normal 0,2410 6,100
Steel; alloyed 0,2259 5,734
Stainless steel 0,2278 5,790
Titanium 0,2370 5,990
Tungsten 0,2129 5,410
Uranium 0,1330 3,370
Zinc; rolled 0,1657 4,210
Zinc; sprayed 0,1756 4,460
Aluminium, AL203 99,5% 0,4013 10,19
Quarz 0,2349 5,968
Pyrex 0,2220 5,640
Lucite 0,1055 2,680
Acrylic glass 0,1077 2,735
Nylon 0,1031 2,620
Polyethylene 0,0705 1,950
Polystyrene 0,0925 2,350
Silicon rubber 0,0373 0,948
Water 0,0590 1,490