diff --git a/gui/src/Visualization/AxisRenderingUtils.cpp b/gui/src/Visualization/AxisRenderingUtils.cpp
index 03b9811..4e88ca9 100644
--- a/gui/src/Visualization/AxisRenderingUtils.cpp
+++ b/gui/src/Visualization/AxisRenderingUtils.cpp
@@ -16,6 +16,9 @@ const auto DATETIME_FORMAT = QStringLiteral("yyyy/MM/dd hh:mm:ss:zzz");
 /// Format for datetimes on a axis
 const auto DATETIME_TICKER_FORMAT = QStringLiteral("yyyy/MM/dd \nhh:mm:ss");
 
+const auto NUMBER_FORMAT = 'g';
+const auto NUMBER_PRECISION = 9;
+
 /// Generates the appropriate ticker for an axis, depending on whether the axis displays time or
 /// non-time data
 QSharedPointer<QCPAxisTicker> axisTicker(bool isTimeAxis, QCPAxis::ScaleType scaleType)
@@ -151,7 +154,7 @@ QString formatValue(double value, const QCPAxis &axis)
         return DateUtils::dateTime(value, axisTicker->dateTimeSpec()).toString(DATETIME_FORMAT);
     }
     else {
-        return QString::number(value);
+        return QString::number(value, NUMBER_FORMAT, NUMBER_PRECISION);
     }
 }
 
diff --git a/gui/src/Visualization/VisualizationGraphRenderingDelegate.cpp b/gui/src/Visualization/VisualizationGraphRenderingDelegate.cpp
index bb7cec4..7d47047 100644
--- a/gui/src/Visualization/VisualizationGraphRenderingDelegate.cpp
+++ b/gui/src/Visualization/VisualizationGraphRenderingDelegate.cpp
@@ -29,6 +29,8 @@ const auto SHOW_AXIS_ICON_PATH = QStringLiteral(":/icones/up.png");
 /// Tooltip format for graphs
 const auto GRAPH_TOOLTIP_FORMAT = QStringLiteral("key: %1\nvalue: %2");
 
+/// Tooltip format for colormaps
+const auto COLORMAP_TOOLTIP_FORMAT = QStringLiteral("x: %1\ny: %2\nvalue: %3");
 
 /// Offset used to shift the tooltip of the mouse
 const auto TOOLTIP_OFFSET = QPoint{20, 20};
@@ -274,6 +276,10 @@ void VisualizationGraphRenderingDelegate::onMouseMove(QMouseEvent *event) noexce
         auto yCellIndex = colorMapCellIndex(*colorMap, y, false);
         auto value = colorMap->data()->cell(xCellIndex, yCellIndex);
 
+        // Sets tooltips
+        tooltip = COLORMAP_TOOLTIP_FORMAT.arg(formatValue(x, *colorMap->keyAxis()),
+                                              formatValue(y, *colorMap->valueAxis()),
+                                              formatValue(value, *colorMap->colorScale()->axis()));
     }
 
     if (!tooltip.isEmpty()) {