Turf-Tec International, Tallahassee, Florida. USA (850) 580-4026

This product is made in the USASee the Clegg Impact Tester in use on YouTube New Clegg Impact Tester / Clegg Decelerometer with Hard Case
For Sports Field Testing and Equine Areas

Click here for model for Golf Courses

Click here to see all our products relating to artificial turf surface

Clegg Impact Tester new GPS and Bluetooth- For Horse Tracks, The 2.25 kg Clegg conforms to standards testing for H.R. 133 Title XII—Horseracing Integrity and Safety Act of 2020 for the racetrack safety program (Stimulus BILL 116 HR 133 Public Law 116–68). It can be used on Dirt, Turf, Synthetic and Grass racetracks.

For 2024 - For Natural Grass Areas, Clegg App now connects to the FieldScout TDR350 for moisture readings

For 2024 - For Natural Grass Areas, Clegg App now connects to the FieldScout TDR350 for moisture readings

The Clegg Impact Tester is a professional instrument used to determine hardness on all types of areas - Readings in Gravities (Gmax), CIT's and F355 Equivalent.

Now with the ability to connect a FieldScout TDR350 Moisture Sensor for natural grass or a Mascaro Infill and Cleat Depth Tester for synthetic turf.

The Clegg Impact Tester is used to determine the hardness of all types of areas. Readings are in Gravities (gMax), CIT's and F355 Equivalent and has wireless Bluetooth display, GPS enabled tablet with data logging and mapping.

The unit comes in three main models:

The PNCLEGG-S-0.5 is a 0.5 kg Model used for testing Golf Greens, approaches and bunker sand. The hammer is lightweight so it will not damage putting surfaces during testing.

The PNCLEGG-S-2.25-A is a 2.25 kg Model used for testing natural grass & synthetic turf athletic fields and reads from 0 to 150 Gravities, 0 to 15 CIT's or 0 to 218 - F355 gMax equivalent readings. This model is the same model that is used to test all NFL National Football League Stadium Fields before games and also all NFL Practice Facilities. App also converts readings to F355 equivalent. The 150 gMax reading on this unit is sufficient for maximum impact readings in the ASTM F355 range after using the conversion formula. 200 g's on F355 Impact Tester = 135 g's on Clegg Impact Tester. The standard test protocol for sports field testing is to drop the hammer one consecutive time on the test area for the reading result.

The PNCLEGG-S-2.25 is a 2.25 kg Model used for Equine testing on Dirt, Turf, Synthetic and Grass racetracks, arenas, equestrian areas and all equine areas.Clegg Impact Tester Mapping with GPS Image

The principle behind the Clegg Impact Soil Tester or Clegg Decelerometer, is to obtain a measurement of the deceleration of a free falling mass (hammer) from a set height onto a surface to determine hardness. The impact of the hammer produces an electrical pulse, which is converted and displayed on the GPS enabled tablet in gravities "gMax", tens of gravities "CIT" or F355 equivalent units. Reference ASTM test methods ASTM 1936, ASTM F355, D5874 and F1702. The Clegg offers the convenience of rapidly testing compaction variations over large areas.

Clegg Impact Tester Winner fo the SFMA (Sports Field Managers Association Innovative New Product Award The standard test protocol developed by Dr. Clegg is to drop the hammer four consecutive times on the same location with the highest value result in the series taken as the Peak Clegg Impact Test result. Since that time, other test protocols have been used based on the materials under test and the application. These other protocols vary the Hammer drop height or use the average result in place of the peak. The Clegg offers the convenience of rapidly scanning compaction variation over large areas. In research studies, 250 tests were performed with the Clegg in a half-day. For Horse Tracks, The 2.25 kg Clegg conforms to standards testing for H.R. 133 Title XII—Horseracing Integrity and Safety Act of 2020 for the racetrack safety program (Stimulus BILL 116 HR 133 Public Law 116–68). It can be used on Dirt, Turf, Synthetic and Grass racetracks.

For 2024 - For Synthetic Turf Areas, Clegg App now connects to the Mascaro Infill and Cleat Depth Tester for infill depth readings For 2024 - For Synthetic Turf Areas, Clegg App now connects to the Mascaro Infill and Cleat Depth Tester for infill depth readings

Turf-Tec International is the exclusive distributor for Lafayette Instruments and sole source provider of the 2.25 kg Clegg Impact testerTurf-Tec International is the exclusive distributor for Lafayette Instruments and sole source provider of the 2.25 kg Clegg Impact tester

See the Clegg Impact Tester in use on YouTubeAvailable in following models

  • 0.5 kg - Used for soft turf, sand areas and golf greens (0 to 500 Gravities)
  • 2.25 kg - Used for surfaces consisting of natural or synthetic turf (football, baseball, soccer fields, playgrounds, pitches, horse tracks and all equine events like Horse Racing, Turf and Dirt Tracks, including synthetic dirt tracks) (0 to 500 Gravities) (+/- 1% or 5 G Accuracy)
  • 2.25 kg-A - New Used for surfaces consisting of natural or synthetic turf (football, baseball, soccer fields, playgrounds, pitches, horse tracks, and golf greens) (0 to 150 Gravities) New (+/- 1% or 1.5 G Accuracy)
  • 4.5 kg - Used for surfaces such as preconstructed soils, trench reinstatement, bell holes, and foundations
  • 10 kg - Used for flexible pavement, aggregate road beds, trench reinstatement, bell holes, and foundations
  • 20 kg - Used for surfaces such as flexible pavement, aggregate road beds, trench reinstatement, bell holes, and foundations

Simple and quick test procedure

  1. The test procedure is very rapid and can easily be performedClegg Impact Tester / Clegg Decelerometer shown with Turf-Tec Level by site personnel with minimal training. Each test can be completed in less than 30 seconds and the results are immediate.
  2. Select a level surface.
  3. Set the guide tube into position. Secure by placing a foot on the tube's base flange and steady with the lower leg and knee.
  4. The tablet app is placed in the test mode and connected to the Clegg as well as a TDR350 for Moisture Readings or a Mascaro Infill and Cleat Depth Tester for infill depth..
  5. The Hammer is raised to the drop height and locked into place by the quick release trigger. Clegg Impact Tester / Clegg Decelerometer Control unit
  6. The level is centered.
  7. The Hammer is released allowing it to fall freely.
  8. The Gravities value (Gmax), CIT value or F355 equivalent reading is displayed and is instantly saved, along with the GPS coordinates, into the Clegg app as well as moisture readings or infill depth if sampled as well.
  9. Move to the next test site and repeat the test procedure.

 Clegg 2019 Screen on Tablet with GPSClegg Impact Tester Mapping with GPS Imagefor Sports Fields

Clegg shown with hard case (Included)

Clegg shown with Turf-Tec hard case included

Clegg shown with Turf-Tec hard case

The Clegg Impact Tester is a professional instrument to determine hardness on baseball fields and clayThe Clegg Impact Tester is a professional instrument to determine hardness on football and soccer fields, both natural and artificialThe Clegg Impact Tester is a professional instrument to determine hardness on grass horse race tracks. For Horse Tracks, The 2.25 kg Clegg conforms to standards testing for H.R. 133 Title XII—Horseracing Integrity and Safety Act of 2020 for the racetrack safety program (Stimulus BILL 116 HR 133 Public Law 116–68). It can be used on Dirt, Turf, Synthetic and Grass racetracks.The Clegg Impact Tester is a professional instrument to determine hardness on sand and clay horse racing tracks
The Clegg Impact Tester is a professional instrument used to determine hardness on all types of areas from baseball, football, soccer, natural grass, artificial turf, infill turf, horse racing, turf racing, rugby, cricket, lacrosse and all types of sports; wherever surface harness is important - from turf care needs to playability and safety.

Specifications:

  • Clegg 2.25 kg Hammer with hardened strike face
  • Guide tube is metal and will provide years of reliable, accurate service
  • Tablet comes ready to use with Clegg Control Application pre-installed and calibrated to your Clegg Hammer (available in the Google Play Store)
  • Weight without case 10.5 lbs

    • Also see our infill depth gauges for accurate and consistent depths of infill materials
    Turf-Tec Professional Model Infill Depth Gauge
    Turf-Tec Economy Model Infill Depth Gauge for synthetic turf

    Unit Comes with the following:

  • Impact Hammer
  • Guide Tube with Foot
  • Bubble Level
  • Samsung Galaxy Tablet "A" with Clegg Control Application
  • GPS Integrated Tablet
  • Bluetooth Sending Unit
  • BNC Coax Cable
  • 12x12 inch Foam Calibration Pad (0-150g 2.25 kg-A unit)
  • Locking Pin to attach Hammer to Guide Tube
  • Handle and Hammer Release Spring Plunger with Lockout
  • Instruction Manual
  • Charger
  • Hard Case
  • Battery Life: 12 Hours
  • 3.7V/1.75Ah Lithium Ion Battery
  • Complete Charge in 3 hours
  • Results displayed/stored on Tablet-Based Application
  • App is also available in the Google Play Store for Android
  • App is also available in Apple Store for Iphone and Ipad
  • Unit Now connects to FieldScout TDR350 and dispalys Moisture Readings
  • Units Now connects to Mascaro Infill & Cleat Depth Tester and displays infill depth and cleat depth
    • See the Clegg Impact Tester in use on YouTube

    The Clegg may be transported and operated by one person, allowing for low cost, rapid field and laboratory testing and direct readout of the test results. The Clegg can test a full range of natural grass fields & synthetic turf fields, all athletic surfaces, pads, infill materials and amendments where hardness or impact characteristics need to be controlled for safety or playability. The Clegg can also test a full range of soil and stone as encountered in the construction of flexible pavement and earthworks. It is useful for quickly checking variations during construction and monitoring changes over time due to seasonal environmental changes or road traffic as well as testing natural and "as constructed" conditions. 

    Clegg Impact Tester Bluetooth Mapping Example
    Clegg Impact Tester Bluetooth Mapping Example
    Clegg Impact Tester Bluetooth Mapping Example
    Clegg Impact Tester Bluetooth Mapping Example
    Clegg Impact Tester Bluetooth Mapping Example
    Clegg Impact Tester Bluetooth Mapping Example
    Clegg Impact Tester Bluetooth Mapping Example
    Clegg Impact Tester Bluetooth Mapping Example
    Clegg Impact Tester Bluetooth Mapping Example
    Clegg Impact Tester Bluetooth Mapping Example
    Clegg Impact Tester Bluetooth Mapping Example
    Clegg Impact Tester Bluetooth Mapping Example
    Clegg Impact Tester Bluetooth Mapping Example
    Clegg Impact Tester Bluetooth Mapping Example
    Clegg Impact Tester Bluetooth Mapping Example

    Link to page on rechargeable battery charging issues for non bluetooth model (2018 and prior)

    Suggested Reading from Penn State University's Center for Sports Turf Research

    "Surface Hardness (Gmax)"
    By: Andrew S. McNitt, Thomas Serensits and Dianne M. Petrukak
    http://cropsoil.psu.edu/ssrc/research/infill/surface-hardness-gmax
    Also:
    http://plantscience.psu.edu/research/centers/ssrc/sportsturf-scoop

    PNCLEGG-S-0.5 -  Clegg Impact Tester 0.5 kg model
    PNCLEGG-S-2.25 - Clegg Impact Tester 2.25 kg model (0 to 500 Gravities) For testing Horse Racetracks and Arenas     (+/- 1% or 5 G Accuracy)
    New PNCLEGG-S-2.25-A-  Clegg Impact Tester 2.25 kg model     (0 to 150 Gravities) For testing all Athletic Fields (natural grass and Synthetic turf)     (+/- 1% or 1.5 G Accuracy)
    Click here to order this product

    Instructions for: PNCLEGG-S-2.25-A-  Clegg Impact Tester 2.25 kg model (0 to 150 Gravities) For testing all Athletic Fields
    Click here for instructions for 2.25 kg 0-150g Clegg Android Version
    Click here for instructions for 2.25 kg 0-150g Clegg IOS Version

    Instructions for: PNCLEGG-S-2.25-  Clegg Impact Tester 2.25 kg model (0 to 500 Gravities) For testing Horse Racetracks and Arenas
    Click here for instructions for 2.25 kg 0-500g Clegg Android Version
    Click here for instructions for 2.25 kg 0-500g Clegg IOS Version

    Click here for video on Clegg Impact Tester

    How to set up Clegg Impact Tester for Sports Field Specific Testing instructional video

    Turf-Tec International

    1471 Capital Circle NW, Suite # 13
    Tallahassee, FL 32303
    Order Line (800) 258-7477
    Phone (850) 580-4026
    Fax (850) 580-4027

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