Here you will find technical information regarding BISON Scales, including instructional videos, support & maintenance information, FAQs, user manuals and more. 

Instructional Videos

Unboxing BISON C-Jacks

How to Weigh with BISON C-Jacks

Unboxing BISON C-Legs

How To Assemble BISON C-Legs

How to Weigh with BISON C-Legs

Support Information


BISON Scales has proven to be very durable. All BISON hardware comes with a minimum one year, limited warranty against defects in materials and manufacturing.

Read our Terms of Sale for more information.


How frequently your BISON Scales need re-calibrating will depend on how heavily the scales are used. The calibration can be affected if the scales are overloaded or exposed to shock loading. We recommend undertaking an annual calibration check.

You can either return your scales to BISON or your local BISON representative for re-calibration. Alternatively, you can easily take care of it yourself with BISON’s Calibration Rig. For more information see our Calibration Kit.

If you have any questions, please call us on + 64 3 395 6134 or email us at


Keeping your scales in top working order is our priority. BISON Scales are coated in a tough thermoplastic, and their rugged design is well suited to your typical heavy-industry environment, so there is little maintenance required.

The hydraulic bottle jacks are a high quality Japanese-made product, which have proven to be very robust. Should an issue arise, the modular design of your weighing equipment makes the scales very simple to diagnose and repair.

BISON carries a full range of spare parts, and can dispatch immediately on request. Call us today on +64 3 395 6134, or send us an email at


For customers who operate in remote locations around the world, distance is no obstacle for BISON. We can use Skype or any other form of communication tool for ongoing support.

BISON has a rich database of training material and can provide you with instruction on all areas of our products - from how to use through to self-service and repair.

You can also use the BISON VGM App for remote diagnostics of your BISON Scales.  

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  • What weighing capacity do BISON scales have?

    BISON Scales have a weighing capacity of 35,000 kg (77,000 lb). Each scale has a weighing capacity of 10,000 kg (22,000 lb).

  • What is the weighing resolution?

    BISON Scales resolve the weight in 1 kg increments, but for OIML certification the total weight is displayed in 50 kg (or 100 lb) increments. This is a tolerance that BISON Scales can easily perform to regarding absolute accuracy and repeatability. It is possible to view the weight results in 1 kg (or 2 lb) increments, where applications require higher resolution and formal certification is not required.

  • How are BISON Scales calibrated?

    All BISON Scales are factory calibrated prior to shipping. Once used, the scales can be re-calibrated with BISON's Calibration Kit. The accuracy tolerance from this method of calibration is better than 1%. A higher accuracy tolerance of better than 0.2% can be achieved by fine-tuning the scales with certified test weights. You can buy your own Calibration Kit, or contact BISON or your dealer to talk about re-calibration service options. 

  • How accurate are BISON Scales?

    The Maximum Permissible Error acceptable for BISON Scales to be 'legal for trade' is ± 75 kg at 35,000 kg, which equates to an accuracy tolerance of around 0.2%. The actual error is typically half this when the equipment is well calibrated with accurate test weights. For general container weighing applications where 'legal for trade' approval is not required, the scales can be easily calibrated on BISON's Calibration Kit, and this results in an accuracy tolerance of better than 1%.

  • How often do the scales need re-calibrating?

    How often you need to re-calibrate BISON Scales depends on what you are using them for, how frequently they are used and the weight of the containers you are weighing. For reliably accurate weighing, re-calibration once per year is recommended.  

  • What approvals do BISON Scales have?

    BISON Scales have OIML R-76 MAA and OIML R-60 approvals, issued by NMi, Netherlands. C-Jacks and C-Legs are type approved and can be certified "legal-for-trade" in Europe, New Zealand and Malaysia. Type approvals are pending in South Africa and Australia. Contact BISON for copies of relevant certificates.

  • What units of measurement do the scales have?

    Kilogram (kg) and pound (lb). The Master Display can be pre-set in either unit. The BISON VGM App can be switched between kg and lb.

  • Are the scales water proof and dust proof?

    Yes. BISON Scales have an IP 64 ingress protection rating. This means the system has complete protection against ingress of dust and there will be no harmful effects from dripping, spraying and splashing water. We recommend inverting the hydraulic bottle jacks after use in wet conditions, to extend their working life by avoiding internal corrosion. A water displacement spray applied to the piston-rod will also help the longevity of the bottle jacks.

  • What is the expected life cycle?

    BISON Scales have a design life of 10 years. Their actual life will depend on how they are cared for and serviced. The internal components are very modular, meaning it's easy to replace the load cell, electronics etc and keep your scales operational.

  • What batteries do the scales use?

    Each scale and the Master Display runs on 4 x regular AA batteries. Good quality alkaline or lithium ion batteries are recommended and will give the longest life span. Rechargeable AA batteries may also be used.

  • What is the battery life?

    The batteries have a 45 hour tested life cycle. This life cycle reduces to approx. 20 hours if the scales are used in low light environments and the LCD backlight turns on.

  • How do I know if the batteries need changing?

    There is a battery life indicator on the display of the scales and the Master Display. It will flash when the batteries need to be replaced.

  • What maintenance is required?

    BISON Scales require very little maintenance. The batteries need to be changed periodically. We supply high quality Japanese-made bottle jacks which have proven to be very robust but can be easily replaced if issues arise. You may also need to re-calibrate and/or re-certify the scales periodically, depending on your application.

  • What warranty does BISON offer?

    Product warranty may vary from country to country. In general, all hardware comes with a 12 month, limited warranty against defects in materials and manufacturing.

  • What range of temperatures can I use BISON scales in?

    BISON Scales have been tested and certified accurate over a temperature range of -10˚C to 40˚C (or 14˚F to 104˚F).

  • How do the scales round up or down?

    BISON Scales resolve the weight in 1kg increments, and the Master Display and BISON VGM App round up or down to the nearest 50 kg or 100 lb.

  • What do the bar symbols mean?

    The bar symbols on the scales' display show how much weight is on the scale. The OIML standard does not permit the weight to be shown on the individual scale, so the symbol display was used instead. For non-certified applications, the scales can be configured to show numbers.

  • How do I zero the scales?

    Give the yellow button a short press. The display will show ------- for about three seconds, and then the zero will be manually reset. A tilda symbol (~) next to the battery symbol will indicate that the zero is set. (Note that the zero can only be manually set by this method if the reading is less than 200 kg. Use the Config App to permanently set the zero). Contact BISON for further details.

  • What surfaces can I weigh containers on?

    The ground surface should be firm, compacted and level for weighing. With due care and attention, it is possible to weigh containers accurately on rough (i.e. gravel) and uneven (i.e. pot holed) surfaces. Steel ground plates are supplied with C-Jacks to spread the load at each corner and minimise marks on the ground. The height and tilt adjustment features on C-Jacks and C-Legs assist with accurate weighing on uneven surfaces and help avoid overloading single corners when weighing heavy containers.

  • Can I weigh containers on a slope?

    The weighing surface should be level. Weighing containers on a slope poses a safety hazard, as the elevated container may have a tendency to slide downhill. It is also important for accurate weighing to keep the scales vertical, as indicated by the “ANGLE” warning on the display.

  • Can I weigh containers from the ends, instead of the sides?

    Yes, you can weigh containers from the ends. As the door end of the container is recessed, BISON can supply a pair of customised plastic blocks - called "spacers" - to fill the gap between the door and the weighing module. The spacers are customised to fit the majority of containers and use magnets to attach to the container. We recommend that care is taken with heavier containers (>20 tonne) to ensure the loading doesn't damage the container door seals and hinges. The rear of the container is the same as the sides, so spacers are not needed at the rear end.

  • How high do I need to lift the container?

    The container only needs to be lifted just clear of the ground or chassis. Typically the lift height is 2-3 cm.

  • How long does it take to weigh a container with C-Legs?

    For an experienced user in good site conditions, it takes one person 8 - 10 minutes to attach, weigh and pack the C-Legs away. The operation can take a little longer when weighing on spring suspension chassis, as the chassis may travel up to a point with the container during lifting. It can take less time if more than one person is involved.

  • How long does it take to weigh a container with C-Jacks?

    For grounded 20' containers, it takes one person 4 - 5 minutes to attach, weigh and pack the C-Jacks away. The operation can take a little longer for 40' containers and less time if more than one person is involved. Here is a time compressed video of the full operation.

  • How many people are needed to weigh a container?

    Only one person is needed to weigh containers with C-Jacks and C-Legs, but two or more people can work in parallel for a faster operation.

  • What container types and sizes can BISON Scales weigh?

    BISON Scales can be used to weigh any length container up to 35,000 kg (77,000 lb). The scales are compatible with all ISO containers, including tank containers and reefers.

  • Can I use C-Legs with air and spring suspension chassis?

    Yes, C-Legs are compatible with both chassis types. Spring suspension chassis tend to "travel" with the container as it is being lifted until the suspension reaches its maximum height. Air suspension chassis provide a firmer lifting platform, particularly when the trailer is parked and the air-bags are empty. It is also possible to lower chassis with air suspension beneath the container once C-Legs are attached.

  • Can I use C-Legs for weighing grounded containers as well?

    Yes, the scales, bottle jacks and Master Display supplied with C-Legs can be used to weigh containers on the ground. BISON can supply ground plates, a trolley and extra bottle jacks with the C-Legs if required, so you have a complete C-Leg and C-Jack system.

  • Are C-Jacks and C-Legs SOLAS approved?

    In general, yes, BISON Scales are OIML approved and suitable for producing SOLAS VGMs, however there may be specific Maritime Rules and Weights & Measures Regulations of your country. The scales also have EU, New Zealand and Malaysian 'legal for trade' approval, which further satisfies requirements for SOLAS VGM Method 1 weighing in Europe, NZ and Malaysia.

  • Are C-Legs safe?

    Yes, the C-Legs are safe. Each of the C-Leg stands, bottle jacks and scales are rated to lift and support 10 tonne per corner, and have a conservative safety margin. The container is elevated only a few centimetres above the trailer. The hazard to be most concerned with in practice is the potential pinch / crush point between the container and trailer, although there is absolutely no reason why any body parts should go near this danger zone. BISON can supply a detailed hazard control register for C-Legs, to help users integrate the system into their health & safety procedures. Contact us for more information.

  • What is OIML Certification?

    OIML is the International Organisation of Legal Metrology (French: Organisation Internationale de Métrologie Légale), is an intergovernmental organisation that promotes standardisation of the legal metrology (weighing) procedures. BISON's weighing equipment is independently certified by NMI Certin in the Netherlands to the OIML standards, and this is recognised by around 120 countries. OIML certification is usually a pre-requisite for 'Trade Approval'.

  • What does 'Trade Approval' mean?

    Where a product is sold by weight, it is a legal requirement that weighing equipment must be verified as ‘legal for trade’ or 'trade approved'. This means that the equipment has undergone a stringent set of tests to ensure it is sufficiently accurate and fit-for-purpose. This is managed by the governmental "Weights and Measures" authority, and OIML certification is usually one of their pre-requisites.

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