diff --git a/shimatta_kenkyusho/parts/models.py b/shimatta_kenkyusho/parts/models.py
index ee019d1..1628ab8 100644
--- a/shimatta_kenkyusho/parts/models.py
+++ b/shimatta_kenkyusho/parts/models.py
@@ -276,6 +276,10 @@ class Component(models.Model):
 	
 	@property
 	def dynamic_description(self):
+
+		if not self.component_type or not self.component_type.description_template:
+			return ''
+
 		django_engine = engines["django"]
 		template = django_engine.from_string(self.component_type.description_template)
 
@@ -325,7 +329,7 @@ class AbstractParameter(models.Model):
 		if my_type == 'E' or my_type == 'I':
 			# Engineering float number
 			(num, prefix) = NumConv.number_to_engineering(self.value, it_unit=(True if my_type=='I' else False))
-			result = f'{num:g}'
+			result = f'{round(num, 3):g}'
 			interpostfix = (prefix if prefix else self.parameter_type.interfix or '.')
 			if '.' in result:
 				result = result.replace('.', interpostfix)
@@ -334,7 +338,7 @@ class AbstractParameter(models.Model):
 			return result
 		elif my_type == 'N':
 			# Standard float number
-			return  f'{self.value:g}{self.parameter_type.unit}'
+			return  f'{round(self.value, 3):g}{self.parameter_type.unit}'
 		else:
 			return self.resolved_value_as_string()