diff --git a/measurements.py b/measurements.py
index c746d7d..7ca7359 100644
--- a/measurements.py
+++ b/measurements.py
@@ -2,20 +2,25 @@
 # this repository contains the full copyright notices and license terms.
 from trytond.model import fields
 from trytond.pool import PoolMeta
+from trytond.pyson import Id
 
 class Measurements(metaclass=PoolMeta):
     __name__ = 'product.template'
 
     temperature = fields.Float("Temperature")
-    temperature_uom = fields.Many2One('product.uom', "Temperature UOM")
+    temperature_uom = fields.Many2One('product.uom', 'Temperature UOM',
+        domain=[('category', '=', Id('product', "uom_cat_temperature"))])
     frequency = fields.Float("Frequency")
     frequency_uom = fields.Many2One('product.uom', "Frequency UOM")
+                                    # ,domain = [('category', '=', Id('product', 'uom_cat_frequency'))])
     wet = fields.Float("Wet")
     wet_uom = fields.Many2One('product.uom', "Wet UOM")
     voltageAC = fields.Float("Voltage AC")
     voltageAC_uom = fields.Many2One('product.uom', "Voltage AC UOM")
+                                      #,domain = [('category', '=', Id('product', 'uom_cat_electrical_tension'))])
     voltageDC = fields.Float("Voltage DC")
     voltageDC_uom = fields.Many2One('product.uom', "Voltage DC UOM")
+                                      #,domain = [('category', '=', Id('product', 'uom_cat_electrical_tension'))])
     
 
     
diff --git a/uom.xml b/uom.xml
index 0d241cc..21786b1 100644
--- a/uom.xml
+++ b/uom.xml
@@ -27,13 +27,43 @@ this repository contains the full copyright notices and license terms. -->
             <field name="rounding" eval="1."/>
             <field name="digits" eval="0"/>
         </record>
-	<record model="product.uom.category" id="uom_cat_frecuency">
+	<record model="product.uom.category" id="uom_cat_frequency">
             <field name="name">Frequency</field>
         </record>
 	<record model="product.uom" id="uom_electrical2">
             <field name="name">Hertz</field>
             <field name="symbol">Hrz</field>
-            <field name="category" ref="uom_cat_frecuency"/>
+            <field name="category" ref="uom_cat_frequency"/>
+            <field name="rate" eval="1."/>
+            <field name="factor" eval="1."/>
+            <field name="rounding" eval="1."/>
+            <field name="digits" eval="0"/>
+	</record>
+	<record model="product.uom.category" id="uom_cat_temperature">
+            <field name="name">Temperature</field>
+        </record>
+	<record model="product.uom" id="uom_celsius">
+            <field name="name">Celsius</field>
+            <field name="symbol">°C</field>
+            <field name="category" ref="uom_cat_temperature"/>
+            <field name="rate" eval="1."/>
+            <field name="factor" eval="1."/>
+            <field name="rounding" eval="1."/>
+            <field name="digits" eval="0"/>
+	</record>
+	<record model="product.uom" id="uom_fahrenheit">
+            <field name="name">Fahrenheit</field>
+            <field name="symbol">°F</field>
+            <field name="category" ref="uom_cat_temperature"/>
+            <field name="rate" eval="1."/>
+            <field name="factor" eval="1."/>
+            <field name="rounding" eval="1."/>
+            <field name="digits" eval="0"/>
+	</record>
+	<record model="product.uom" id="uom_kelvin">
+            <field name="name">Kelvin</field>
+            <field name="symbol">°K</field>
+            <field name="category" ref="uom_cat_temperature"/>
             <field name="rate" eval="1."/>
             <field name="factor" eval="1."/>
             <field name="rounding" eval="1."/>