diff --git a/rp_utilities.py b/rp_utilities.py
index 0a42b21..c1f64a8 100644
--- a/rp_utilities.py
+++ b/rp_utilities.py
@@ -1,37 +1,52 @@
-def relock_squid(rp, array_max=0.05, delay=0.1):
-    """ Attempts to detect if the SQUID is unlocked and relock if necessary. Windows only.
-        Inputs:
-            - rp: Red Pitaya object as defined by rp = p.rp, where p = Pyrpl('squid_lockbox')
-            - array_max: threshold for the absolute value of array voltage to detect unlocking
-            - delay: time delay in seconds between subsequent loops
+import time
+import msvcrt
+from qtpy import QtWidgets
+
+
+def get_keypress():
+    return ord(msvcrt.getch()) if msvcrt.kbhit() else 0
+
+
+def relock_squid(rp, array_max=0.05, delay=1e-3, enable_gui=True):
+    """Attempts to detect if the SQUID is unlocked and relock if necessary (Windows only).
+
+    Args:
+        rp: Red Pitaya object as defined by rp = p.rp, where p = Pyrpl('squid_lockbox').
+        array_max (float): Threshold for the absolute value of array voltage to detect unlocking.
+        delay (float): Time delay in seconds between subsequent loops.
+        enable_gui (bool): If True, allow the GUI to continue running while the re-lock loop is running.
     """
-    import time
-    import msvcrt
-    def get_keypress():
-        return ord(msvcrt.getch()) if msvcrt.kbhit() else 0
-
-    msg0 = 'GUI disabled while relock loop is running.\n'
-    msg1 = 'Current lock point: Mod V = {}, Array V = {}.\n'.format(rp.scope.voltage_in1, rp.scope.voltage_in2)
-    msg2 = 'Will relock if |array voltage| > {} or if PID output saturates.\n'.format(array_max) 
-    msg3 = 'Enter "q" to exit loop. '
-    print(msg0 + msg1 + msg2 + msg3)
+
+    msg = [
+        f"Current lock point: Mod V = {rp.scope.voltage_in1}, Array V = {rp.scope.voltage_in2}.",
+        f"Will relock if |array voltage| > {array_max} or if PID output saturates.",
+        f"Enter 'q' to exit loop.",
+    ]
+    print("\n".join(msg))
+
+    gui = QtWidgets.QApplication.instance()
+
     while True:
         try:
-            if get_keypress() == 113: # q
+            if get_keypress() == 113: # User pressed "q"
                 raise KeyboardInterrupt
-            if abs(rp.pid0.ival) > 3.98 or abs(rp.scope.voltage_in2 - rp.pid0.setpoint) > array_max:
-                print('Relocking SQUID...')
+            if (
+                abs(rp.pid0.ival) > 3.98 # Integrator has railed
+                or abs(rp.scope.voltage_in2 - rp.pid0.setpoint) > array_max # Lock was lost
+            ):
+                print("Relocking SQUID...")
                 rp.pid0.ival = 0
-                time.sleep(delay * 5)
-                print('New lockpoint: Mod V = {}, Array V = {}.'.format(rp.scope.voltage_in1, rp.scope.voltage_in2))
-                print(msg3)
-                print('-----------------------------------------')
+                time.sleep(delay * 10)
+                print(f"New lockpoint: Mod V = {rp.scope.voltage_in1}, Array V = {rp.scope.voltage_in2}.")
+                print(msg[-1])
+                print("-" * 40)
+            if enable_gui and gui is not None:
+                gui.processEvents()
             time.sleep(delay)
         except KeyboardInterrupt:
-            n = input('Exit relock loop? y/[n] ')
-            if n.strip().lower() == 'y':
-                print('Exiting relock loop, reenabling GUI...')
+            n = input("Exit relock loop? y/[n] ")
+            if n.strip().lower() == "y":
+                print("Exiting relock loop...")
                 break
             else:
-                print('Relock loop still running.')
-        finally: pass
+                print("Relock loop still running.")