For a weighing instrument to be suitable for trade use, the National Measurement Act 1960 states it must:
- operate within the limits of error permitted under the regulations
- be pattern approved.
The national instrument test procedures (NITPs) below include procedures for testing each weighing instrument.
We issue certificates of approval for pattern approved instruments under these categories:
You can apply a label advertising your business on the measuring instruments you verify. You must, however, ensure it cannot be confused with a verification mark or you may be in breach of the Act. We suggest adding 'this is not a verification mark' to your label to avoid confusion.
Find out more about placing verification labels on the verifying instruments for trade page.
You may need to verify a non-automatic weighing instrument (NAWI) with a load receptor different to its certificate of approval. A manufacturer may have supplied the alternative load receptor or the business modified the original to suit their needs. Modifications can include adding scoops or rollers to the original or replacing the load receptor with a different type.
We still consider a NAWI with a modified load receptor, an approved pattern if:
You may need to verify a weighing instrument after it has been adjusted or repaired. This depends on whether the non-compliance issue could affect its metrological performance.
Don’t re-verify if a trade measurement inspector has marked it non-compliant because of:
After repair, the trader can use the instrument for trade.
You will need to re-verify if the non-compliance issues include:
Ensure you remove or obliterate the previous verification mark. After any adjustment or repair, you can re-verify the instrument.
Non-automatic weighing instruments must be level when you conduct a test for verification.
If the level bubble is not clearly visible to the user, you must affix a notice indicating where it is on the instrument.
Explain to the trader that if an instrument is not level and giving inaccurate measurements, it may be an offence under the Act. They must also ensure their staff know how to check whether their instruments are staying level.
Direct them to weighbridges used for trade to find out more.
The general certificate 6B/0: conversion of weighing instruments allows you to submit a conversion certificate for your NAWI. The general certificate has calculations to determine if the components used to convert or manufacture an instrument are suitable.
To submit a conversion certificate for an instrument (except a full load cell) with a capacity over 100 kg, you can only:
When verifying, you must be mark these instruments with the conversion number (i.e. 6B/XXX).
Adjacent platforms on a multi-platform weighbridge can come into contact with each other as vehicles move on and off the weighbridge. This is usually due to the design or installation of the platforms.
Although contact may be minimal, the adjacent platform may temporarily display an indication other than zero with no load. The temporary display of a load other than zero is acceptable while a vehicle is moving over the multi-platform weighbridge.
When a vehicle is stationary and the indicators are stable, the indicated weight must reflect the applied load within the applicable MPE (zero or otherwise).
Weighbridges without a pit must have:
If a weighbridge does not comply, the trader must either: