When a balance receives a certificate of approval from NSC/NMI it will be approved under a certain class of accuracy which determines the parameters that the machine needs to meet when submitted for trade stamping.
One of the key parameters that will apply is the verification interval which is the minimum increment that the balance can be approved to. Given the high number of divisions displayed by a balance the verification interval for trade will always differ from the best increment of the balance. An example would be in the case of the GX-2000 where the balance can be read to 0.01 g but the verification interval when the machine is stamped for trade is 0.1 g.
Most of the balances will still display the non significant digit, normally highlighted by a bracket or similar, but some balances such as the Class III EK-i will drop the last digit completely, while the EW-150i drops an entire range. It is important to remember that the verification digit is the one to which the balance is certified, to make things clearer we have listed the trade approved balances below complete with their approval accuracy class and verification digit.
Trade Approved Balances
| Model or Series | Verification Digit |
| EK-410i 400g x 0.01g Class III | Verification Digit 0.1g |
| EK-610i 600g x 0.01g Class II | Verification Digit 0.1g |
| EK-4100i 4000g x 0.1g Class III | Verification Digit 1g |
| EK-6100i 6000g x 0.1g Class II | Verification Digit 1g |
| EW-150i 30/60/150g X 0.01/0.02/0.05g Class II | Verification Digit 0.02g/0.05g dual range |
| EW-1500i 300/600/1500g X 0.1/0.2/0.5g Class III | Verification Digit 0.1g/0.2g/0.5g |
| EW-12Ki 3000/6000/12000g X 1/2/5g Class III | Verification Digit 1g/2g/5g |
| FZ-300i 320g x 0.001g Class II | Verification Digit 0.01g |
| FZ-3000i 3200g x 0.01g Class II | Verification Digit 0.1g |
| FZ-300i-WP 320g x 0.001g Class II | Verification Digit 0.01g |
| FZ-3000i-WP 3200g x 0.01g Class II | Verification Digit 0.1g |
| GX-200 210g x 0.001g Class II | Verification Digit 0.01g |
| GX-400 410g x 0.001g Class II | Verification Digit 0.01g |
| GX-600 610g x 0.001g Class II | Verification Digit 0.01g |
| GX-2000 2100g x 0.01g Class II | Verification Digit 0.1g |
| GX-4000 4100g x 0.01g Class II | Verification Digit 0.1g |
| GX-6100 6100g x 0.01g Class II | Verification Digit 0.1g |
| GX-8000 8100g x 0.1g Class II | Verification Digit 1g |
| GF-200 210g x 0.001g Class II | Verification Digit 0.01g |
| GF-300 310g x 0.001g Class II | Verification Digit 0.01g |
| GF-400 410g x 0.001g Class II | Verification Digit 0.01g |
| GF-1200 1210g x 0.01g Class II | Verification Digit 0.1g |
| GF-2000 2100g x 0.01g Class II | Verification Digit 0.1g |
| GF-3000 3100g x 0.01g Class II | Verification Digit 0.1g |
| GF-4000 4100g x 0.01g Class II | Verification Digit 0.1g |
| GF-61000 6100g x 0.01g Class II | Verification Digit 0.1g |
| GF-6000 6100g x 0.1g Class II | Verification Digit 1g |
| GX-8K 8100g x 0.01g Class I | Verification Digit 0.1g |
| GX-10K 10100g x 0.01g Class I | Verification Digit 0.1g |
| GX-20K 20000g x 0.1g Class II | Verification Digit 1g |
| GX-10K 10100g x 0.01g Class II | Verification Digit 1g |
| GP-12KA 12kg x 0.1g Class II | Verification Digit 1g |
| GP-20KA 21kg x 0.1g Class II | Verification Digit 1g |
| GP-32KA 6.1kg x 0.1g /31kg x 1g Class II | Verification Digit 1g |
| GP-30KA 31kg x 0.1g Class II | Verification Digit 1g |
| GP-100KA 101kg x 1g Class II | Verification Digit 10g |