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ZFG D plus
With ultra-light, modern electronics box that send the measurement data to your mobile device via Bluetooth. > Flyer
ZFG 3.1
With a small handheld device that can be hung over the shoulder for maximum mobility. > Flyer
ZFG 3000
With compact measuring electronics in a sturdy case, including printer. Operation is possible even when the lid is closed. > Flyer
Calibration centers and services worldwide : Quality made in Germany
The Benchmark in Dynamic Plate Load Testing.
Over 70,000 ZORN devices are in use worldwide – many of them performing flawlessly for decades. That’s what real quality looks like.
With more than 150 years of precision-engineering expertise, ZORN INSTRUMENTS Germany delivers measurement technology you can trust: exceptional accuracy, uncompromising durability, and industry-leading service supported by a global network of calibration centers. We know our devices inside out – and we know exactly what your construction site demands.
If safety, precision, and long-term reliability matter in your dynamic plate load testing, choose the Light Weight Deflectometer from ZORN.
Get your no-obligation consultation today and discover how simple reliable compaction testing can be – with ZORN, the service leader.
Compare our top Light Weight Deflectometers
Why choose a ZFG D plus?
1. Wireless freedom
- Bluetooth connection to smartphone or tablet (Android & iOS).
- No annoying cables – greater freedom of movement and comfort on the construction site.
2. Easy to use
- Take measurements directly with a mobile device.
- Voice-guided measurement process.
- Create complete test reports on site (with the special D plus app or the ZORN FG-WebApp with even more options).
- Email reports quickly and easily.
3. Comprehensive documentation
- GPS coordinates of the measurement are recorded automatically.
- Air temperature at the test point with frost warning.
- Photos, soil and weather information as well as specific project details can be added to the test report.
4. Maximum efficiency
- Complete and simple data processing possible on site.
- Direct exchange of results with site management, colleagues or clients.
- Free app with ongoing updates included.
5. Future-proof solution
State-of-the-art technology combined with proven ZORN quality.
Internationally applicable thanks to multilingual app.
Robust, ultra-lightweight design for tough everyday use on construction sites.
Tablet, printer, magnetic base and other accessories are also available. Just ask your dealer or have look here.
Why choose a ZFG 3.1?
1. Handy and comfortable
Compact, ergonomic design of the measuring electronics in a robust plastic housing.
Durable full-leather case provides reliable protection against dust and splashing water.
2. Easy to use
Menu navigation easy to understand, even for non-experienced users.
Backlit, graphics-capable display with curve display.
Acoustic feedback while measurement.
Automatic calculation of settlement (s), s/v value, and deformation modulus Evd.
Option to enter text directly on the device for additional information.
3. Powerful equipment
Powerful WLAN module for wireless data transfer directly to smartphones, tablets, etc.
Precise positioning of measuring points with improved GPS/GNSS receiver.
Automatic storage on SD card with maximum storage capacity.
4. Connected & flexible
Free web app (multilingual) for secure reporting, report generation and emailing.
Fast data transfer via Wi-Fi - independent of smartphone/tablet.
Especially for users who prefer classic, standalone, compact measurement electronics.
Printers, magnetic base, carrying cases and other accessories are also available. Just ask your dealer or have look here.
Why choose a ZFG 3000?
1. Handy and robust
- Compact measuring electronics in a robust case with a practical option for operating the electronics from the outside with the lid closed.
- Dust and water-resistant, can also be used in harsh construction site conditions.
2. Easy to use
Menu navigation easy to understand, even for untrained users.
Backlit, graphics-capable display with curve display.
Acoustic feedback while measurement.
Automatic calculation of settlement (s), s/v value, and deformation modulus Evd.
Option to enter text directly on the device for additional information.
3. Powerful equipment
- Wi-Fi module for wireless data transfer to smartphones, tablets or PCs.
- GPS receiver for precise positioning of measurement points.
- Extremely powerful battery for long operating times on the construction site.
- Thermal printer for on-site printing.
4. Connected and flexible
Free ZORN FG-WebApp (multilingual) for secure evaluation, report generation and emailing.
Fast data transfer via Wi-Fi - independent of smartphone or tablet.
Ideal for users who prefer classic, standalone measurement electronics with an integrated printer.
Magnetic base, carrying case and other accessories are also available. Just ask your dealer or have look here.
A Light Weight Deflectometer: The original ZFG (LWD) for precise soil testing!
The ZORN Light Weight Deflectometer (ZFG) is the practical solution for fast and reliable compaction testing in earthworks, road construction, civil engineering, sewer and pipeline construction, landscaping and bridge construction. In less than two minutes, you can use the dynamic plate load test according to different standards (see below) to determine the deformation modulus Evd and thus the bearing capacity and compaction quality of the soil – without the need for expensive load vehicles. This proven method provides construction companies, engineers and authorities with reliable results directly on site.
Thanks to its modular design, modern electronics (three to choose from) and state-of-the-art GPS/GNSS and Wi-Fi or Bluetooth equipment, measurement is particularly easy. The ZORN FG-WebApp, which is free for ZORN customers, enables precise and convenient documentation.
Very easy to use: even users with no prior knowledge can take reliable measurements with the Light Weight Deflectometer.
International standardisation of the Light Weight Deflectometer with ZORN
Australia (Queensland): Test Method Q726B: Deflections – Portable Impulse Plate Load Test Device
Austria: RVS 08.03.04, Verdichtungsnachweis mittels dynamischen Lastplattenversuches
Belgium: Standaardbestek 250 versie 5.0 (2024)
Russia: N° 52068-12, Свидетельство об утверждении типа - State Register for approved measuring instruments
Spain: UNE 103807-2:2021, Ensayo de carga vertical de suelos mediante placa dinámica. Parte 2: Placa rígida, diámetro 2r=300 mm, Método 2.
Switzerland: VSS 70 313 (2025)
Ukraine: DSTU B W.2.3-42:2016
United Kingdom: BS 1924-2 (2025)
USA: ASTM E2835-21, Standard Test Method for Measuring Deflections Using a Portable Impulse Plate Load Test Device
Video
Light Weight Deflectometer
Best Light Weight Deflectometer!? Additional advantages of all ZORN ZFG models:
- Tried-and-tested mechanics meet a flexible, selectable control module (see above) - individually expandable with accessories.
- Robust, surface-finished mechanics - ideal for harsh construction site conditions.
- Testing in confined spaces (e.g., bridge underpasses, pipe trenches)
- Can be used without a load vehicle or other aids
- Ergonomic triangular grab handle made from a single piece – does not roll away during transportation, no weld seams, lifetime warranty.
- Modular design: standard base plate with adapter pin for 150 mm plate or dynamic CBR test (laboratory and field)
- Calibration reminder plus unique self-test for maximum functional reliability
- Preload shocks, can be deactivated
- Integrated plausibility check
- Very short test duration of two minutes with very easy handling
- Professional instruction on site possible
- Application aids: videos, training courses, operating instructions and much more
All mechanical components of our testing and measurement technology are manufactured entirely in our factory in Germany. Components and accessories are sourced from first-class suppliers. This independence enables us to respond quickly to repairs and maintenance requests - even for models that have been in use for decades.
You can find the most important details about ZFG in our flyer.
Integrated Wi-Fi
ZORN was the first to make data transmission via WLAN (Wi-Fi) standard. Two clicks in the settings: done.
The D plus, introduced in 2019, ensures fast online transmission of Evd measurement data by connecting ZFG sensors to smartphones and tablets via Bluetooth. If you prefer a classic electronics box, the ZFG 3.1 or ZFG 3000 is the perfect solution.
The multilingual ZORN FG-WebApp allows you to edit and forward your measurement data directly - including easy report generation. Free for ZORN customers.
You can find an overview of all apps in this Flyer.
Improved GPS receiver
In addition, all Light Weight Deflecometers are equipped with improved GPS and receive signals from GPS, Galileo and GLONASS simultaneously – the horizontal accuracy is thus around 2 m (CEP). The module is already integrated in many models.
As usual, the Light Weight Deflectometer can be flexibly adapted with accessories - from a magnetic base to a printer case to a shipping box.
...by the way.
High-precision test technology Made in Germany
Trusted by users in over 100 countries, ZORN INSTRUMENTS delivers innovative, reliable testing solutions.
For more than 70 years, we have developed and produced high-precision tools for quality testing – from fast on-site checks in road construction to classic laboratory material tests. With our mix of engineering expertise, craftsmanship, and close customer support, we provide solutions that meet the ever-changing demands of quality assurance. You can get an idea of our products in our digital showroom.
Ever heard about the Asphalt Tester?
No? Have a look.
Do you know the ZORN Pressure Filtration LAB!
Find out more.
Dynamic plate load test
The ZFG Light Weight Deflectometer (LWD) is ideal for rapid testing of the bearing capacity of compacted soils.
The current ZFG 3.1 and ZFG 3000 models set standards for carrying out the so-called "dynamic plate load test" on the construction site. In just two minutes, even inexperienced users can reliably test the compaction quality of installed material layers. The load-bearing capacity of existing soils can also be tested effortlessly with a ZORN Light Weight Deflectometer. The use of the devices is backed up worldwide by recognized technical standards such as the German TP BF-StB, Part B 8.3 or the North American ASTM-E 2835-11.