diff --git a/pytec/pytec/gui/view/param_tree.json b/pytec/pytec/gui/view/param_tree.json
index 7a5ffdd..c3deabc 100644
--- a/pytec/pytec/gui/view/param_tree.json
+++ b/pytec/pytec/gui/view/param_tree.json
@@ -205,7 +205,7 @@
                "title": "R₀",
                "type": "float",
                "value": 10000,
-               "step": 1,
+               "step": 100,
                "min": 0,
                "siPrefix": true,
                "pinSiPrefix": "k",
@@ -224,7 +224,7 @@
                "title": "B",
                "type": "float",
                "value": 3950,
-               "step": 1,
+               "step": 10,
                "suffix": "K",
                "noUnitEditing": true,
                "decimals": 4,
@@ -269,7 +269,6 @@
                "title": "Kp",
                "type": "float",
                "step": 0.1,
-               "suffix": "",
                "compactHeight": false,
                "thermostat:set_param": {
                   "topic": "pid",
@@ -406,9 +405,8 @@
                      "type": "float",
                      "value": 1.5,
                      "step": 0.1,
-                     "prefix": "±",
                      "format": "{value:.4f} {suffix}",
-                     "suffix": "°C",
+                     "suffix": "K",
                      "noUnitEditing": true,
                      "compactHeight": false,
                      "pid_autotune": "temp_swing",