Portable Container Scales

BISON C-Jacks are wireless scales for weighing shipping containers to accuracy levels of up to +/- 0.2%. Quick and easy to use, the scales transmit weight data to a mobile App, which records the gross weight and captures other useful data such as the date, time, location, load distribution, photos, container ID and seal ID. 

  • Weigh containers on the ground and on chassis
  • OIML certified and "legal-for-trade" approved in over 30 countries
  • Works on all ISO container types and sizes up to 35 tonne
  • High strength materials and coatings for 10-year life cycle

Alongside C-Jacks we offer stands for weighing containers on chassis, a calibration kit and App allowing you to diagnose, configure and calibrate the scales yourself, plus spare part kits and certification services.

See How They Work

"It's simple to use and gives us the accurate weight we need."

- Mike Lawrence, Transport & Warehouse Manager, Kuehne + Nagel

C-Jacks Specifications

Unit of Measure
kg or lb
Weighing Capacity
35,000 kg or 77,000 lb
Display Increments
50 kg or 100 lb
High strength steel frame with thermoplastic powder coat. Tough glass-filled nylon casing
Load Cells
10,000 kg or 22,000 lb weighing capacity per scale. 150% service overload capacity. 300% ultimate overload limit.
4 x standard AA batteries per scale. 40+ hour battery life cycle.
OIML Approvals
OIML R-76 MAA and OIML R-60
Standard Components
4 x certified wireless container scales
4 x custom bottle jacks
4 x steel ground plates
1 x master indicator
1 x trolley
Optional Extras
C-Jack stands
Calibration kit & configuration app
Service kit & spare parts

VGM App & Database

Keep Weight Data Flowing

With the BISON VGM App, you can capture container weights and related info on your smart phone, email digital VGM certificates from the field, and access the data you've captured - anywhere, anytime - via the VGM Database. 

  • Calculate the gross (VGM) and net container weight 
  • Record the container's load distribution
  • Log photos, container ID, seal ID, and more
  • Email a signed VGM certificate as soon as the container is weighed
  • Push data into your IT system 

The VGM App keeps valuable information flowing and eliminates the errors and delays that come with paper weight dockets, messy handwriting, physical weight calculations and manual data entry.

You can try out the VGM App today. It's easy. Just download the App to an Android device via this Google Play link. Go to Settings in the App, select "Simulate BISON Devices", return to Home, then press "Weigh a Container".

VGM App Features

  Basic FeaturesPremium Features
Receive gross weight from BISON Scales
Calculate net and tare weight
Confirm weight distribution
Capture location, time and date
Add optional shipment details
Email basic weight record
Access outbox of 40 weight records
Edit and re-send weight records
Multiple languages
Diagnostics capability
Email signed VGM certificates  
Add your own logo to the VGM certificate  
Add photos to the weight record  
Barcode scanner  
Send CSV, XML and PDF attachments  
Send data directly to your own URL server  

Self Sufficient Calibration

C-Jacks hold their accuracy well. However like any weighing instrument, heavy use can affect calibration over the longer term. Instead of having third party scale technicians check and recalibrate the scales, you can do this easily yourself to better than 1% accuracy with the BISON Calibration Kit. It takes only a few minutes per scale to calibrate. Our App guides you through a quick and easy process, automatically making necessary adjustments to the C-Jacks' calibration and giving you piece of mind that your scales are true and accurate.

  • Reliable weight readings
  • Less downtime
  • Lower cost of ownership

Calibration Kit FAQs

  • What does the Calibration Kit include?

    The Calibration Kit includes the following items as standard:

    • 1 x Calibration Module
    • 1 x Digital Indicator
    • 1 x Bubble Level
    • 1 x Plastic Carry Case
    • BISON Config App

    You will need an Android smartphone to download and run the Config App.

  • How does the Calibration Kit work?

    The calibration is made by comparing the reading from your C-Jacks scales with the Calibration Module in your Calibration Kit. Weight is applied simultaneously to the Calibration Module and the scale, using the corner of a container, and the readings from both are compared. If they are different, the scale is adjusted by the Config App to match the reading from the Calibration Module. The process is repeated with each of the four container scales in the C-Jacks set.

  • How heavy does the container need to be?

    The weight of the container should ideally be over 12 tonnes (26,000 lbs) for the load on the Calibration Module and C-Jacks to be significant enough to see a discernible difference. But the precise weight of the container is not important, as the Calibration Module provides the reference value.

  • What is the level of accuracy achieved with the Calibration Kit?

    Your C-Jack scales will read within 1% of perfect after calibration with the Calibration Kit. This level of accuracy is generally sufficient for most container weighing applications. If you would like even better accuracy, we supply a Calibration Rig, that will deliver better than 0.5% accuracy. Or if your C-Jacks need to be verified as 'legal for trade', an accuracy tolerance of 0.2% can be achieved by fine-tuning the calibration with certified test weights.

  • How frequently should I recalibrate my BISON C-Jacks?

    We recommend you have your C-Jacks' calibration checked annually, but timing really depends on how you use them. Calibration can be affected by overloading and shock loading. If your C-Jacks are often used to weigh heavy containers, then their calibration should be checked more frequently than if they are seldom used or used to weigh light containers. It also depends on how critical accuracy is to your operations. With your own Calibration Kit you can check as often as you wish.

  • How reliable is the accuracy of the Calibration Kit?

    The Calibration Kit is calibrated in an accredited laboratory, prior to delivery, and has a fully traceable certificate of calibration. As the Calibration Kit is protected from heavy impacts and overloads, it can be relied upon to remain true, whereas C-Jacks may be exposed to the heavy-duty rigours of container weighing. The accuracy of the Calibration Kit can be checked and confirmed periodically in the laboratory if desired.

  • What is calibration?

    Calibration is the process of maintaining the accuracy of your weighing instrument. In this case, it involves comparing a container weight measurement produced by the Calibration Kit, which is known to be highly accurate, with the weight measurement produced by your C-Jacks. Any variation can then be corrected, or "calibrated".

  • Why is calibration important?

    Calibration is important for a number of reasons, including:

    • It ensures readings from your C-Jacks are always accurate
    • It establishes that weights produced by your C-Jacks are reliable and can be trusted
    • It ensures payloads are always optimised improving revenue
    • It improves safety by ensuring container weights are accurate and evenly distributed
  • Is calibration the same as 'trade approved'?

    No. The Calibration Kit and Config App provide an easy and reliable way to make sure your C-Jacks are reading accurately. The accuracy tolerance is better than 1%. However in some countries, for some container weighing applications, BISON C-Jacks need to be 'legal-for-trade approved' for use. BISON has a network of Service Partners around the world who can assist you with the verification testing needed for trade approval. This typically involves calibrating C-Jacks, with certified test weights, to a more finely tuned accuracy tolerance of better than 0.2%.

Weigh containers on the chassis

With C-Jack Stands, you can weigh your container on the chassis, eliminating the costs incurred from weighbridges & allowing the weighing process to work on your schedule. Extending the tried & tested C-Jacks system, the C-Jack Stands are a quick, reliable option to satisfy your container weighing needs. 

  • Engineered to safely support and weigh the heaviest containers
  • Levelling mechanism, to accommodate uneven ground surfaces
  • Wedge-lock feet for extra stability and a kick bar
  • Puncture proof pneumatic tyres for easy mobility and storage

Self-contained and easy to use, BISON C-Jacks with Stands are the world’s most portable, versatile and accurate solution for weighing containers on chassis. 

Weigh Containers From the Ends

BISON Spacers

If you stand your containers close together, you can still weigh containers from the front and rear using C-Jacks and a pair of customised plastic blocks called Spacers. 

Spacers are contoured to fit the majority of containers, they attach using magnets, and fill the gap between the door and the C-Jack scale. The rear of the container is the same as the sides, so Spacers are not needed here. Always remember to take care with containers over 20,000 kg (44,000 lb), to make sure the front-loading doesn't damage the container door seals and hinges.


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