What is OIML?
In the "International Organization of Legal Metrology" work representatives of 100 states for uniform construction and testing of all instruments. In the certification system of OIML the certificates issued by the member states attest that a specific measuring equipment type matches the OIML recommendations. So a construction tested and approved in one country can be approved in another country without repeating the examination.
The OIML guidelines specify maximum design characteristics for test standards define how material, surface texture, markings, construction, form, etc.
OIML error Limits according to OIML R 111
| Error limits (tolerance ±) | |||||||
|---|---|---|---|---|---|---|---|
| nominal value |
E1 | E2 | F1 | F2 | M1 | M2 | M3 |
| 1 mg | ±0.003mg | ±0.006mg | ±0.020mg | ±0.06mg | ±0.20mg | ||
| 2 mg | ±0.003mg | ±0.006mg | ±0.020mg | ±0.06mg | ±0.20mg | ||
| 5 mg | ±0.003mg | ±0.006mg | ±0.020mg | ±0.06mg | ±0.02mg | ||
| 10 mg | ±0.003mg | ±0.008mg | ±0.025mg | ±0.08mg | ±0.25mg | ||
| 20 mg | ±0.003mg | ±0.010mg | ±0.03mg | ±0.10mg | ±0.3mg | ||
| 50 mg | ±0.004mg | ±0.012mg | ±0.04mg | ±0.12mg | ±0.4mg | ||
| 100 mg | ±0.005mg | ±0.016mg | ±0.05mg | ±0.16mg | ±0.5mg | ±1.6mg | |
| 200 mg | ±0.006mg | ±0.020mg | ±0.06mg | ±0.20mg | ±0.6mg | ±2.0mg | |
| 500 mg | ±0.008mg | ±0.025mg | ±0.08mg | ±0.25mg | ±0.8mg | ±2.5mg | |
| 1 g | ±0.010mg | ±0.03mg | ±0.10mg | ±0.3mg | ±1.0mg | ±3.0mg | ±10mg |
| 2 g | ±0.012mg | ±0.04mg | ±0.12mg | ±0.4mg | ±1.2mg | ±4.0mg | ±12mg |
| 5 g | ±0.016mg | ±0.05mg | ±0.16mg | ±0.5mg | ±1.6mg | ±5.0mg | ±16mg |
| 10 g | ±0.020mg | ±0.06mg | ±0.20mg | ±0.6mg | ±2.0mg | ±6.0mg | ±20mg |
| 20 g | ±0.025mg | ±0.08mg | ±0.25mg | ±0.8mg | ±2.5mg | ±8.0mg | ±25mg |
| 50 g | ±0.03mg | ±0.10mg | ±0.3mg | ±1.0mg | ±3.0mg | ±10mg | ±30mg |
| 100 g | ±0.05mg | ±0.16mg | ±0.5mg | ±1.6mg | ±5.0mg | ±16mg | ±50mg |
| 200 g | ±0.10 mg | ±0.3mg | ±1.0mg | ±3.0mg | ±10mg | ±30mg | ±100mg |
| 500 g | ±0.25mg | ±0.8mg | ±2.5mg | ±8.0mg | ±25mg | ±80mg | ±250mg |
| 1 kg | ±0.5mg | ±1.6mg | ±5.0mg | ±16mg | ±50mg | ±160mg | ±500mg |
| 2 kg | ±1.0mg | ±3.0mg | ±10mg | ±30mg | ±100mg | ±300mg | ±1,0g |
| 5 kg | ±2.5mg | ±8.0mg | ±25mg | ±80mg | ±250mg | ±800mg | ±2,5g |
| 10 kg | ±5.0mg | ±16mg | ±50mg | ±160mg | ±500mg | ±1600mg | ±5,0g |
| 20 kg | ±10mg | ±30mg | ±100mg | ±300mg | ±1000mg | ±3000mg | ±10g |
| 50 kg | ±25mg | ±80mg | ±250mg | ±800mg | ±2500mg | ±8000mg | ±25g |
| 100 kg | ±160mg | ±500mg | ±1600mg | ±5000mg | ±16g | ±50g | |
| 200 kg | ±300mg | ±1000mg | ±3000mg | ±10g | ±30g | ±100g | |
| 500 kg | ±800mg | ±2500mg | ±8000mg | ±25g | ±80g | ±250g | |
| 1000 kg | ±1600mg | ±5000mg | ±16g | ±50g | ±160g | ±500g | |
| 2000 kg | ±10g | ±30g | ±100g | ±300g | ±1000g | ||
| 5000 kg | ±25g | ±80g | ±250g | ±800g | ±2500g | ||
As test weights to in-plant control of precision balances KERN also offers NON-OIML weights that do not meet the above mentioned requirements. They can also be used for DAkkS calibrations, but no accuracy class is recorded on the calibration certificate.
NON-OIML weights are not admitted for verification.