diff --git a/dmi.py b/dmi.py
index ab9ada1..fff8862 100644
--- a/dmi.py
+++ b/dmi.py
@@ -23,7 +23,7 @@ def main():
                 gui.update_beat_spectrum(spectrum, peak_freq, locked)
                 induction.set(tuning)
 
-            stabilizer = Stabilizer(block_size, (1088.1e6 - freq_base)/freq_sample, stabilizer_cb)
+            stabilizer = Stabilizer(freq_sample, block_size, 1088.1e6 - freq_base, stabilizer_cb)
             position_tracker = PositionTracker(int(0.1*freq_sample/block_size))
 
             sdr = SoapySDR.Device()
diff --git a/gui_impl.py b/gui_impl.py
index 1dc29e8..af4e6aa 100644
--- a/gui_impl.py
+++ b/gui_impl.py
@@ -55,7 +55,7 @@ class MainWindow(pg.GraphicsLayoutWidget):
         if peak_freq is None:
             self.text_ref.setText("REF: NO SIGNAL")
         else:
-            self.text_ref.setText("REF: {:.3f}MHz".format((self.freq_base + self.freq_sample*peak_freq)/1e6))
+            self.text_ref.setText("REF: {:.3f}MHz".format((self.freq_base + peak_freq)/1e6))
         if locked:
             self.text_locked.setText("REF LASER LOCKED", color="00FF00")
         else:
diff --git a/noptica.py b/noptica.py
index 27c3365..3998237 100644
--- a/noptica.py
+++ b/noptica.py
@@ -106,8 +106,8 @@ class InductionHeater:
 
 
 class Stabilizer:
-    def __init__(self, block_size, freq_target, cb):
-        self.freqs = np.fft.fftfreq(block_size)
+    def __init__(self, freq_sample, block_size, freq_target, cb):
+        self.freqs = np.fft.fftfreq(block_size, d=1/freq_sample)
         self.freq_target = freq_target
         self.cb = cb
 
@@ -116,8 +116,8 @@ class Stabilizer:
         self.wiggle_direction = 1
 
         self.amp_threshold = 80.0
-        self.k = 50.0
-        self.tolerance = 0.010
+        self.k = 50.0e-6
+        self.tolerance = 10e3
         self.lock_counter_threshold = 60
         self.unlock_counter_threshold = 600
         self.wiggle = 0.1