In square plastic bottles, PE, 250 ml, labeled with an individual batch no. on the bottles, traceable to PTB and NIST
| Code | Description |
| BOE 300141 | 1,413 mS/cm KCL 0,01 mol/l (25°C), 250 ml |
| BOE 301288 | 12,88 mS/cm KCL 0,1 mol/l (25°C), 250 ml |
| BOE 311180 | 111,8 mS/cm KCL 1 mol/l (25°C), 250 ml |
