What this category covers
Industrial testing equipment answers mechanical and physical questions about a product: how hard it is, how much load it carries before it yields, how thick the coating is, how smooth the surface, whether it leaks. These tests are destructive or semi-destructive and are carried out on samples, prototypes or finished goods, and the result is normally a number that has to be defensible to somebody else.
That is why the method, not the instrument, is the natural starting point. A hardness value means nothing until the scale is named, a tensile result means nothing until the specimen geometry and the test rate are stated, and a coating thickness reading depends on the substrate and the measuring principle. The enquiry that begins with a standard and a specimen ends with the right instrument; the enquiry that begins with an instrument ends in a second purchase.
Method-based inspection that leaves the part intact - ultrasonic, eddy current, magnetic particle, penetrant and radiographic testing - is deliberately separated into Non-Destructive Testing, because buyers search for it as a distinct discipline with its own certification and acceptance standards.
Product types in industrial testing equipment
| Product type | How it works | Usually specified for |
| Hardness tester | Indentation or rebound at the surface, reported on a defined scale | Incoming inspection of metals, verification after heat treatment and weld checks, where the scale has to be agreed in advance |
| Tensile testing machine | Controlled load applied to a specimen while force and displacement are recorded together | Material certification, weld and fastener testing, and product development where strength is the property in question |
| Compression testing machine | Load applied to a specimen or an assembly until it deforms, seats or fails | Concrete and building materials, packaging, springs, and component crush or seating checks |
| Impact testing machine | A known energy delivered to a notched specimen, and the energy absorbed in breaking it | Toughness verification and material acceptance where the procedure calls for the test |
| Coating thickness gauge | Magnetic induction, eddy current, or ultrasonic reflection from the coating boundary | Paint, plating, galvanising and powder-coat inspection on steel and non-ferrous substrates |
| Surface roughness tester | Stylus traversing the surface, or optical comparison against a reference specimen | Finish verification after machining, and acceptance of a specified surface condition |
| Leak tester | Pressure decay or pressure hold against a defined limit, or a tracer gas detected outside the part | Sealed assemblies, valves and heat exchangers - any part that has to be shown to hold pressure |
| Pressure test bench | Controlled pressurisation of a component or a line to a specified level, held for a specified time | Proof and burst testing, hydrostatic tests, and pressure verification before delivery |
Vibration test equipment, temperature test equipment, material testing machines and general industrial inspection equipment are listed under this category too.
How to choose a testing instrument
There is rarely a single correct instrument for a duty, but there is always a
shortlist that can be justified and a set of answers that eliminates the rest. These
are the questions that decide it.
- The test method and the standard the result has to comply with, named explicitly. The method dictates the instrument, not the other way round, and a result without a stated method is not comparable with anything.
- Whether the part can be marked or has to be preserved, which separates the methods in this category from non-destructive inspection.
- Capacity against requirement: the load, thickness or roughness range has to cover the working point with margin, and the resolution has to be sufficient where the judgement is made.
- Where the test happens - laboratory, line side or field - which decides whether a portable instrument or a fixed machine is appropriate.
- Specimen handling: geometry, fixturing, alignment, and whether a batch has to be prepared and tested at a rate.
- Temperature during the test, because it affects both the material and some of the sensors involved, and a result quoted without it is incomplete.
- Reporting: whether results are read and recorded, stored and exported, or printed as a certificate that forms part of the delivery.
- Calibration: the reference standards and intervals the instrument needs, and whether the supplier issues the certificates that go with them.
- The installation itself - bench or floor space, services, guarding and the operator routine - since a machine that does not fit the routine is not used.
Working through the selection in order
- Name the property to be measured, and the standard that defines how it is measured.
- Establish whether the part can be marked or has to remain intact, which separates the methods in this category from non-destructive inspection.
- Fix the capacity and the resolution at the working point rather than the widest range available.
- Decide where the test happens, and whether the instrument has to be moved to the part or the part brought to the instrument.
- Define the specimen interface: fixture, grip, traverse length, or access to the surface being measured.
- Specify the data requirement, from read-and-record through to a printed acceptance certificate.
- Confirm the calibration route and the certificates needed, including the reference standards the procedure names.
- Check the installation and the operating routine, then price the complete setup rather than the machine alone.
Comparing the technologies
| Method | Best suited to | Limits | Property measured |
| Indentation hardness | Finished parts and heat-treated surfaces where a small permanent mark is acceptable | Scales are not interchangeable without a documented relationship, and surface condition influences the reading | Hardness on a defined scale |
| Rebound hardness | Large parts and field measurements where the instrument has to be carried to the work | Depends on the mass and rigidity of the part and on the surface being prepared, so a thin or flexible part misleads | Hardness on a defined scale |
| Load frame with force and displacement | Strength, elongation and modulus derived from a prepared specimen | Needs a defined specimen geometry, fixturing and rate; results are only comparable under the same conditions | Tensile and compression properties |
| Magnetic and eddy-current coating measurement | Coating thickness on metal, measured without damaging the finish | The substrate and the coating have to be known, and thin coatings on rough surfaces are the difficult case | Coating thickness |
| Stylus profilometry | Surface finish reported as a numerical value against a defined parameter | A traverse is a line rather than an area, so it has to be taken where the surface is representative | Surface roughness |
| Pressure decay and tracer gas | Sealed assemblies where a pass or fail limit can be defined in advance | Sensitive to temperature change during the test and to the internal volume of the part being tested | Leak tightness |
Parameters to confirm before ordering
What is left after the technology is chosen is a list of values that only the
installation can supply. These are the ones that change the model, the price or the
lead time:
- The property to be measured and the standard the result has to satisfy.
- The range and resolution needed at the point of judgement, together with the values expected in normal production.
- The material and its condition, thickness or geometry, as applicable to the chosen method.
- The specimen: size, shape, and how it will be held or presented to the instrument.
- Where the test is carried out, and whether the instrument has to be portable.
- The test rate, if a batch has to be processed, and how the specimens are prepared.
- The data requirement: local display, stored results, exported files or printed certificates.
- Calibration and certification required, with the reference standards the customer procedure names.
- Environment: temperature, humidity, dust, and any requirement around vibration or clean conditions.
- Any site requirement around services, guarding or operator safety that affects the installation.
Figures are quoted, not assumed
Specifications vary by model and application, so no performance figure is stated on
this page. Where a parameter has not been documented for a particular model, the
product page says so rather than filling the gap with a plausible number. Send the
values above and we will return the ones the selected model actually holds.
Where these instruments are used
