Pendulum Testing for Businesses & Lawyers from £447

Expert Witness Services & Comprehensive CPR Reports in Slip Injury Claims from £497

Cheap Off Site Floor Sample Testing from £147


Cheap Floor Tests for Businesses and Lawyers available in In all Major UK Cities and nearby Towns including  Floor Testing  in Scotland – Aberdeen, Glasgow, Edinburgh, Perth, Stirling, Inverness and fife / Floor Safety Risk Assessments in North East England – Middlesborough, South Shields, Newcastle, Stockton on Tees, Darlington / Floor Pendulum Testing in North West England – Manchester, Lancaster, Liverpool, Runcorn, Preston, Blackpool, Blackburn Bury, Bolton, Warrington, Widnes, St.Helens (Cheshire) Birkenhead, Ellesmere Port, Chester, Crewe, Oldham, Stockport, Trafford Park. Rochdale, Congleton, Sandbach Macclesfield, / Floor Pendulum Tests in Wales in Cardiff, Newport, Swansea, Colwyn, Rhyl, Bangor / Pendulum Floor Slip Tests in Northern Central England – Sheffield, Leeds, Bradford (Yorkshire), Rotherham, Wakefield, / Slip Resistance Testsing in East England in Hull, Humberside and Lincoln / BS7976-2 Pendulum Tests in the Midlands in– Nottingham, Derby, Rugby, Stoke, Stafford, Birmingham, Wolverhampton, Worcester, / Pendulum Flooring Tests in Central England – Northampton, Rugby, Derby, Oxford, Cambridge, Peterborough / HSE and BS7976 Approved Floor Testing in London and Home Counties – Watford, Milton Keynes, St.Albans, Cambridge, Newbury, Reading, Andover, Heathrow / Slip Injury Floor Tests in South England – Portsmouth, Brighton, Eastbourne, Southampton, Bournemouth, Salisbury, Isle of Man /  Floor Testing in Slip Accident Claims in South West England – Swindon, Bristol, Bath, Plymouth, Exeter, Falmouth, Cheltenham, Gloucester, Taunton, Warwick / Cheap Floor Testing in South East England – Dover, Margate, Rochester, Folkestone, Hastings, Tunbridge Wells,

Avoid Slip Injury Claims – Call FloorSlip Today

Main UK Pendulum Floor Testing offices at Preston, Blackpool (Lancashire) and Banbury, Oxford, Rugby and Coventry, (Oxfordshire and Warwickshire) - United Kingdom

UK Specialists in Independent & Impartial Slip Injury Assessments + Floor Safety Assessments for Businesses using H&S Approved Pendulum Tests to BS7976-2 & BS13036-4

UK North   07774  32 32 67       UK South   07506  55 99 52


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FloorSlip Ltd – UK Registered Limited Company 07757686

Please note - Apr 18 - The FloorSlip web site is undergoing maintenance - we apologise for any corrupt data or broken links and will resolve soon

The Floor Surface Roughness Test saves you money by monitoring if Floors are Safe to help you avoid Slip Injury Claims

Floor Surface Roughness Test Equipment

The Surface Roughness Test is a Health & Safety Executive approved method of monitoring floor wear and an ‘indication’* of how slippery a Floor is in everyday circumstances.

It is conducted using the Surtronic Duo, a hand held floor testing equipment, which determine floor surface roughness or ‘micro roughness’ (Rz) from which an approximation* of floor slipperiness can be established. The floor is measured in microns (1 Micron = 1 millionth of 1 metre and 1 human scalp hair is approximately 100 microns)

(*Note - ONLY Pendulum Testing gives an accurate reading of whether a floor is liable to cause a slip accident; particularly in the wet or when contaminated as this is when 90% of slip injury accidents occur) .

We don’t just test floors for Surface Roughness - we also test engineering products from 1 - to  200 microns

Floor Surface Roughness Testers

This floor test equipment:


- Gives a good indication** of the grip potential of a floor surface or floor coatings

- Can be used to study local variations in a floor

- Is useful to check areas inaccessible to larger floor testing equipment

- Provides a means to monitor changes in floor surface properties over a period of time

- Offers a good complementary floor measurement* to the pendulum slip test

- Can also be used to test the surface roughness of engineering products such as steel

**Overall, though admirable in its abilities, the floor surface roughness tester should only be used as part of the overall assessment of a floor and not to measure floor slip resistance itself and could not be used to provide supporting evidence for or against a personal injury claim. Only the Pendulum Test and its results (PTV or Pendulum Test Values) are accepted for the purpose of providing a true reading of floor slip resistance in a court of law

Method of Use of the Surface Roughness Tester

The lower section of the 2 part floor tester is placed on the flooring surface and a diamond stylus (needle) is motored across a small section of the floor. The stylus movement is automatically and remotely recorded on the top section  of the floor roughness tester as it travels up and down the tiny peaks and valleys of the floor surface and a number of samples are taken sequentially (in the example below = 5). The average (mean) of the measurements, the Rz Value, gives an indication of total surface roughness.

Floor Surface Roughness for a given floor contaminant (Source HSE)

The following table gives an idea of the surface roughness readings you might find for a given floor contaminant. It is possible to build up a clear picture for your own office, workshop, factory or reception etc

Floor Surface Roughness in wet floor scenarios (Source HSE)

More than 90% of floor slip accidents occur on wet floors and normally on relatively smooth floor surfaces. - (Source - UK Health and Safety Executive)

The advisory table below of the floor slip risk potential indicates the slip resistance of flooring materials under water-wet conditions. Note - The information does not define a ‘floor safety status’ of any floor or flooring material but simply gives an indication of a floor state. It is always recommended a Pendulum Test is conducted to give accurate slip resistance readings; the results of which can be used as evidence in court in the event of a personal injury claim.  

Slips Assessment Tool (SAT) Floor Slip Assessment Software

To aid you further, the Health & safety Executive has devised a software tool known as the Slips Assessment Tool (SAT), which correlates the Rz readings found in conjunction with local flooring conditions to give the user a good indication of the slip potential of floor surfaces; further information can be found at

Read More on the Slips Assessment Tool

Surtronic Duo Surface Roughness Meter - Calibration and Setup Guide

Calibrating the Surtronic Duo - This image is available to download as a PDF

The PDF image should be of a size that will fit into the Surtronic Duo case when folded

Floor Surface Roughness in Microns*

Floor Slip Potential Risk

Below 10 microns


Between 10 and 20 microns


Above 20 and up to 30 microns


Above 30 microns

Extremely Low

For further information read

Click on for larger image

The surface of your Floor Floor Surface Roughness

Floor surface micro roughness might look just like the Grand Canyon under a microscope. The shape of the peaks, in this case ‘pointed’ would dig into shoes helping to eliminate floor slip and the depth of the valleys help dispel liquids and contaminants increasing grip potential. Note - rounded peaks generally offer less slip resistance

floor micro roughness testingFloorSlip’s choice of Floor Surface Roughness equipment

FloorSlip use the HSE recommended (Ametek) Taylor Hobson Surtronic Duo for the purpose of testing floor micro roughness; suitable for multiple floor finishes like Granite, Stone and Concrete Flooring; to internal floor surfaces – Ceramic Marble, Smooth Wood and Laminates and exotic floor materials - Resin; Glass, Metal, Vinyl and Plastics . (It is not recommended for use on carpet, or rough floors).

For Interest for You - The Surtronic Duo is also known as the ‘Kenny’ as it has the same shape as the character in South Park!

Minimum Floor Surface Roughness (Rz) in Microns*

Floor Contaminant

20 microns

Clean Water, Coffee, Soft Drinks

45 microns

Soap Solution, Milk

60 microns

Milk Cooking Stock

70 microns

Motor Oil, Olive Oil

Above 70 microns

Gear Oil, Margarine

For further information read

rz floor sample

View of a floor surface through a microscope

   The Surface Roughness or ‘Rz’  =   Z1 + Z2 + Z3 + Z4 + Z5

                                                                      5  (samples)


Surface Roughness Measurement ‘R’ Parameters

The Surtronic Duo measures 5 different Roughness (R) parameters

Ra - Average Best Fit Line

Rz - Peak To Valley Average Sampling

Rt - Max in Peak to Valley sampling

Rp - Max Peak in sampling

Rv - Max Valley in sampling

Information courtesy of Taylor Hobson

For further information contact  Taylor Hobson -


UK 0116 276 3771 (Switchboard)

UK 0116 246 3016 (Direct)

email :