diff --git a/src/aare/gui/panels/monochromator_panel.py b/src/aare/gui/panels/monochromator_panel.py
index 28f787e5..56b98f4b 100644
--- a/src/aare/gui/panels/monochromator_panel.py
+++ b/src/aare/gui/panels/monochromator_panel.py
@@ -1,3 +1,5 @@
+from aarecommon.config.beamline import mx_beamline
+from aarecommon.models.beamline import MXBeamline
 from aarecommon.models.models import DAQStatusModel
 from PySide6.QtCore import Signal, Slot
 from PySide6.QtWidgets import QDoubleSpinBox, QGridLayout, QLabel, QPushButton, QWidget
@@ -9,8 +11,8 @@ from aare.gui.widgets.title_label import TitleLabel
 # TODO: placeholder range (was an arbitrary 1-30; nothing downstream validates —
 # daq.change_energy forwards straight to bec) — confirm the real monochromator
 # limits with the Beamline Scientist. Shared by both Set Energy rows.
-ENERGY_MIN_KEV = 4.0
-ENERGY_MAX_KEV = 20.0
+# X10SA mono reaches 6-30 keV; others keep the placeholder until confirmed.
+ENERGY_MIN_KEV, ENERGY_MAX_KEV = (6.0, 30.0) if mx_beamline() == MXBeamline.X10SA else (4.0, 20.0)
 # "arrived" window for the moving->neutral transition; per-hardware knob like
 # MotorMoveGroup's tol (the mono never lands exactly on the setpoint)
 ENERGY_AT_TARGET_TOL_KEV = 0.001