diff --git a/pytec/pytec/gui/view/param_tree.json b/pytec/pytec/gui/view/param_tree.json
index e90d379..8f5a1b7 100644
--- a/pytec/pytec/gui/view/param_tree.json
+++ b/pytec/pytec/gui/view/param_tree.json
@@ -215,7 +215,7 @@
             },
             {
                "name": "rate",
-               "title": "Postfilter Rate",
+               "title": "50/60 Hz Rejection Filter",
                "type": "list",
                "value": 16.67,
                "param": [
@@ -224,11 +224,11 @@
                   "rate"
                ],
                "limits": {
-                  "Off": null,
-                  "16.67 Hz": 16.67,
-                  "20 Hz": 20.0,
-                  "21.25 Hz": 21.25,
-                  "27 Hz": 27.0
+                  "16.67 SPS": 16.67,
+                  "20 SPS": 20.0,
+                  "21.25 SPS": 21.25,
+                  "27 SPS": 27.0,
+                  "Off": null
                },
                "tip": "Adjust the output data rate of the enhanced 50 Hz & 60 Hz rejection filter\n(Helps avoid mains interference)",
                "lock": false