388.5 g/kg = 390.404 PSU
| g/kg | PSU |
|---|---|
| 373.5 g/kg | 375.33 |
| 378.5 g/kg | 380.355 |
| 383.5 g/kg | 385.379 |
| 388.5 | 390.404 |
| 393.5 g/kg | 395.428 |
| 398.5 g/kg | 400.453 |
| 403.5 g/kg | 405.477 |
388.5 g/kg = 390.404 PSU
1 g/kg ≈ 1.0049 PSU · 1 mg/L ≈ 0.001 PSU · 1 ppm ≈ 0.001 PSU (dilute aqueous approximation)