# ``ctd_ph_unknown_scale``
## Properties
:dimensions: N_PROF, N_LEVELS
:dtype: float64
## Default Attributes
| Attribute | Value |
|-----|-----|
|``whp_name`` | ``CTDPH`` |
|``C_format`` | ``%9.4f`` |
|``C_format_source`` | ``database`` |
## Description
The measure of acidity of seawater reported on an unknown scale using an in situ electrode. SDN:P01::PHXXPR01
:::{warning}
The reporting scale is not known. Use caution when comparing this pH to any other pH, though it is probably reported on the NBS scale
:::