

| U-51 | U-52 | U-52G | U-53 | U-53G | |
| pH | * | * | * | * | * |
| ORP (Oxidation Reduction Potental) | * | * | * | * | * |
| Dissolved Oxygen | * | * | * | * | * |
| Conductivity | * | * | * | * | * |
| Salinity | * | * | * | * | * |
| TDS (Total Dissolved Solids) | * | * | * | * | * |
| Seawater Specific Gravity | * | * | * | * | * |
| Temperature | * | * | * | * | * |
| Turbidity (LED) | * | * | |||
| Turbidity (Tungsten Lamp) | * | * | |||
| Water Depth | * | * | * | ||
| GPS | * | * |