Merge branch 'feat/mark10-unit-autodetect'

2 files changed, 13 insertions, 0 deletions

diff --git a/api_layers/protocols/mark10.py b/api_layers/protocols/mark10.py
index a209232..48ed927 100644
--- a/api_layers/protocols/mark10.py
+++ b/api_layers/protocols/mark10.py
@@ -44,6 +44,11 @@ class Mark10Layer(BaseProtocol):
         super().__init__(port, baud, poll_interval, simulate)
         self._unit = "N"
 
+    @property
+    def current_unit(self) -> str:
+        """Last unit suffix seen in a gauge reply (e.g. "N", "kgF")."""
+        return self._unit
+
     # ── Protocol ──────────────────────────────────────────────────────────
 
     def _poll(self) -> Dict[str, float]:
diff --git a/devices/serial_device.py b/devices/serial_device.py
index 580421c..449956b 100644
--- a/devices/serial_device.py
+++ b/devices/serial_device.py
@@ -142,6 +142,14 @@ class SerialDevice(BaseDevice):
         raw = self._layer.read()
         if not raw:
             return {}
+        if self._fmt == "mark10" and hasattr(self._layer, "current_unit"):
+            # Gauge can be switched between lb/kgF/N/ozF on the device itself —
+            # keep the channel's unit in sync so new plots/pickers/CSV log
+            # headers pick up the currently-selected unit instead of a fixed
+            # default. Does not relabel the axis of an already-open plot pane.
+            force_ch = self.get_channel("force")
+            if force_ch is not None:
+                force_ch.unit = self._layer.current_unit
         if self._fmt not in _GENERIC_FORMATS:
             # Protocol layers already key by channel_id — pass through untouched.
             # (Write-only channels, e.g. CML "M1_VS", never appear in raw — correctly dropped.)