diff --git a/pytec/pytec/gui/view/param_tree.json b/pytec/pytec/gui/view/param_tree.json
index a5fbee5..0cef4cd 100644
--- a/pytec/pytec/gui/view/param_tree.json
+++ b/pytec/pytec/gui/view/param_tree.json
@@ -89,6 +89,7 @@
                      ],
                      "format": "{value:.4f} {suffix}",
                      "suffix": "°C",
+                     "regex": "(?P<number>[+-]?((((\\d+(\\.\\d*)?)|(\\d*\\.\\d+))([eE][+-]?\\d+)?)|((?i:nan)|(inf))))\\s*((?P<siPrefix>[uyzafpnµm kMGTPEZY]?)(?P<suffix>.*))?$",
                      "noUnitEditing": true,
                      "compactHeight": false,
                      "param": [
@@ -201,6 +202,7 @@
                ],
                "format": "{value:.4f} {suffix}",
                "suffix": "°C",
+               "regex": "(?P<number>[+-]?((((\\d+(\\.\\d*)?)|(\\d*\\.\\d+))([eE][+-]?\\d+)?)|((?i:nan)|(inf))))\\s*((?P<siPrefix>[uyzafpnµm kMGTPEZY]?)(?P<suffix>.*))?$",
                "noUnitEditing": true,
                "compactHeight": false,
                "param": [
@@ -392,6 +394,7 @@
                      "step": 0.1,
                      "format": "{value:.4f} {suffix}",
                      "suffix": "°C",
+                     "regex": "(?P<number>[+-]?((((\\d+(\\.\\d*)?)|(\\d*\\.\\d+))([eE][+-]?\\d+)?)|((?i:nan)|(inf))))\\s*((?P<siPrefix>[uyzafpnµm kMGTPEZY]?)(?P<suffix>.*))?$",
                      "noUnitEditing": true,
                      "compactHeight": false,
                      "pid_autotune": [
@@ -430,6 +433,7 @@
                      "step": 0.1,
                      "format": "{value:.4f} {suffix}",
                      "suffix": "°C",
+                     "regex": "(?P<number>[+-]?((((\\d+(\\.\\d*)?)|(\\d*\\.\\d+))([eE][+-]?\\d+)?)|((?i:nan)|(inf))))\\s*((?P<siPrefix>[uyzafpnµm kMGTPEZY]?)(?P<suffix>.*))?$",
                      "noUnitEditing": true,
                      "compactHeight": false,
                      "pid_autotune": [