diff --git a/orchestra/contrib/resources/helpers.py b/orchestra/contrib/resources/helpers.py
index 042f4104..3611ad95 100644
--- a/orchestra/contrib/resources/helpers.py
+++ b/orchestra/contrib/resources/helpers.py
@@ -34,7 +34,7 @@ def get_history_data(queryset):
                     serie = {}
                     for data in datas:
                         date = date_filter(data.date)
-                        value = round(float(data.value or 0)/scale, 2)
+                        value = round(float(data.value)/scale, 3) if data.value is not None else None
                         all_dates.add(date)
                         serie[date] = value
                 else:
@@ -42,7 +42,7 @@ def get_history_data(queryset):
                     for data in datas:
                         date = data.created_at.timestamp()
                         date = int(str(date).split('.')[0] + '000')
-                        value = round(float(data.value or 0)/scale, 2)
+                        value = round(float(data.value)/scale, 3) if data.value is not None else None
                         serie.append(
                             (date, value)
                         )
diff --git a/orchestra/contrib/resources/templates/admin/resources/resourcedata/history.html b/orchestra/contrib/resources/templates/admin/resources/resourcedata/history.html
index c6b0a80d..0e7b98ce 100644
--- a/orchestra/contrib/resources/templates/admin/resources/resourcedata/history.html
+++ b/orchestra/contrib/resources/templates/admin/resources/resourcedata/history.html
@@ -46,7 +46,6 @@
                 });
              },
             columns: function (div, i, seriesOptions, resource){
-                console.log(div);
                 $(div).highcharts({
                     chart: {
                         type: 'column',
@@ -68,6 +67,9 @@
                             style: {
                                 fontWeight: 'bold',
                                 color: (Highcharts.theme && Highcharts.theme.textColor) || 'gray'
+                            },
+                            formatter: function () {
+                                return this.total + ' ' + resource['unit'];
                             }
                         }
                     },
@@ -85,8 +87,8 @@
                     tooltip: {
                         formatter: function () {
                             return '<b>' + this.x + '</b><br/>' +
-                                this.series.name + ': ' + this.y.toFixed(2) + ' ' + resource['unit'] + '<br/>' +
-                                'Total: ' + this.point.stackTotal.toFixed(2) + ' ' + resource['unit'];
+                                this.series.name + ': ' + this.y.toFixed(3) + ' ' + resource['unit'] + '<br/>' +
+                                'Total: ' + this.point.stackTotal.toFixed(3) + ' ' + resource['unit'];
                         }
                     },
                     plotOptions: {
@@ -99,7 +101,7 @@
                                     textShadow: '0 0 3px black'
                                 },
                                 formatter: function () {
-                                    return this.series.name + ': ' + this.y.toFixed(2) + ' ' + resource['unit'];
+                                    return this.series.name + ': ' + this.y.toFixed(3) + ' ' + resource['unit'];
                                 }
                             }
                         }