diff --git a/GUI/Model/Device/InstrumentItems.cpp b/GUI/Model/Device/InstrumentItems.cpp
index b9d0dd47842f09b2654e0aebf28c424d060af493..d48c153d1ced4a58093755579cc59fc521a43174 100644
--- a/GUI/Model/Device/InstrumentItems.cpp
+++ b/GUI/Model/Device/InstrumentItems.cpp
@@ -94,11 +94,11 @@ InstrumentItem::InstrumentItem()
     : m_withPolarizerAnalyzer(false)
 {
     m_id = QUuid::createUuid().toString();
-    m_analyzerEfficiency.init("Analyzer efficiency", "Efficiency of the polarization analysis", 0.0,
+    m_analyzerEfficiency.init("Analyzer efficiency", "Efficiency of the polarization analysis", 1.0,
                               Unit::unitless, 4 /* decimals */, RealLimits::limitless(),
                               "efficiency");
     m_analyzerTotalTransmission.init(
-        "Analyzer transmission", "Total transmission of the polarization analysis", 1.0,
+        "Analyzer transmission", "Total transmission of the polarization analysis", 0.5,
         Unit::unitless, 4 /* decimals */, RealLimits::nonnegative(), "transmission");
     m_polarization.init("Polarization (Bloch vector)",
                         "Polarization of the beam, given as the Bloch vector", Unit::unitless,