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 – 300 mm, depending on test material and chosen sensor
Accuracy Adjustable ± 0.01 mm
Memory capacity 500 storage places
Resolution 0.01 mm in the range of 0.8 – 99.99 mm
0.1 mm in the range of 0.1 – 300 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 145 x 68 x 28 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/µs) V (m/s)
Aluminium; rolled 0,2530 6420
Aluminium; 6061-T6 0,2510 6383
Beryllium 0,5073 12890
Brass, 70 CU, 30 Zn 0,1850 4700
Copper; rolled 0,1972 5010
Duraluminium 0,2487 6320
Iron 0,2345 5960
Lead; rolled 0,0771 1960
Magnesium 0,2270 5770
Molybdenum 0,2470 6250
Monel 0,2105 5350
Nickel 0,2377 6040
Steel; normal 0,2331 5920
Steel; alloyed 0,2259 5734
Stainless steel 0,2278 5790
Titanium 0,2402 6100
Tungsten 0,2129 5410
Uranium 0,1330 3370
Zinc; rolled 0,1657 4210
Zinc; sprayed 0,1756 4460
Aluminium, AL203 99,5% 0,4013 10190
Quarz 0,2349 5968
Pyrex 0,2220 5640
Lucite 0,1055 2680
Acrylic glass 0,1077 2735
Nylon 0,1031 2620
Polyethylene 0,0705 1950
Polystyrene 0,0925 2350
Silicon rubber 0,0373 948
Water 0,0590 1490