diff --git a/CHANGES b/CHANGES
index 9008a1d..2997861 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,3 +1,26 @@
+
+Version 0.9.7: 2019-05-04
+
+FeatureExpert added support for the Vario 451 heat meter. Thanks FeatureExpert!
+
+New feature: --addconversions=GJ,L
+
+This feature required a major rewrite of how meters print their data.
+When the new option --addconversion=<unit> is used, then
+any meter that outputs a compatible unit (like kWh) will have
+the additional unit (like GJ) also added to to the json.
+
+So if there is a total_energy_consumption_kwh in the json,
+there will now also be a total_energy_consumption_gj
+
+For the human readable output and the fields output, the kWh is replaced with GJ.
+
+ATTENTION! change in json keys!
+
+Some untyped json field names, like "flow_temperature":10 had to
+change name to "flow_temperature_c":0 (so that if --addconversions=F
+is used, then "flow_temperature_f":32 will be added.)
+
 Version 0.9.6: 2019-04-27
 
 Added support for the MK Radio 3 water meter. Thanks FeatureExpert!
diff --git a/README.md b/README.md
index 06ff0c2..573505e 100644
--- a/README.md
+++ b/README.md
@@ -81,6 +81,7 @@ Usage: wmbusmeters {options} <device> ( [meter_name] [meter_type] [meter_id] [me
 
 As <options> you can use:
 
+    --addconversions=<unit>,<unit> change/add units for the meter output
     --c1 or --t1 listen to C1 or T1 messages when no meters are supplied
     --debug for a lot of information
     --exitafter=<time> exit program after time, eg 20h, 10m 5s
@@ -123,13 +124,13 @@ Kamstrup flowIQ 3100 (flowiq3100)
 Sontex Supercom 587 (supercom587)
 Sensus iPERL (iperl)
 Apator at-wmbus-16-2 (apator162) (non-standard protocol)
-Water meter Techem MK Radio 3 (mkradio3)
+Water meter Techem MK Radio 3 (mkradio3) (non-standard protocol)
 
 Supported heat cost allocator:
 Qundis Q caloric (qcaloric)
 
 Supported heat meter:
-Heat meter Techem Vario 4 (vario451)
+Heat meter Techem Vario 4 (vario451) (non-standard protocol)
 
 Supported electricity meters:
 Tauron Amiplus (amiplus) (includes vendor apator and echelon)
@@ -274,6 +275,12 @@ The source code is modular and it should be relatively straightforward to add mo
 
 Read for example the text file: HowToAddaNewMeter.txt
 
+# Caveat
+
+If you do not get proper readings from the meters with non-standard protocols. apator162, mkradio3, vario451
+then you have to open an issue here and help out by logging a lot of messages and reverse engineer them
+even more..... :-/
+
 # Good documents on the wireless mbus protocol:
 
 https://oms-group.org/download4all/
diff --git a/src/cmdline.cc b/src/cmdline.cc
index 10f5329..d074f2f 100644
--- a/src/cmdline.cc
+++ b/src/cmdline.cc
@@ -144,7 +144,7 @@ unique_ptr<Configuration> parseCommandLine(int argc, char **argv) {
             i++;
             continue;
         }
-        if (!strncmp(argv[i], "--addconversion=", 16)) {
+        if (!strncmp(argv[i], "--addconversions=", 16)) {
             if (strlen(argv[i]) > 16)
             {
                 string s = string(argv[i]+16);
diff --git a/src/main.cc b/src/main.cc
index b88c55a..c2f85d9 100644
--- a/src/main.cc
+++ b/src/main.cc
@@ -255,7 +255,10 @@ void startUsingCommandline(Configuration *config)
                 config->link_mode = toMeterLinkMode(m.type);
                 config->link_mode_set = true;
             } else {
-                if (config->link_mode != toMeterLinkMode(m.type) && type_and_device.first != DEVICE_RTLWMBUS) {
+                if (config->link_mode != toMeterLinkMode(m.type)
+                    && type_and_device.first != DEVICE_RTLWMBUS
+                    && type_and_device.first != DEVICE_SIMULATOR)
+                {
                     // sdr_rtl|rtl_wmbus can listen to both C1 and T1 at the same time.
                     error("A different link mode has been set already.\n");
                 }
diff --git a/src/units.cc b/src/units.cc
index e41337d..085461e 100644
--- a/src/units.cc
+++ b/src/units.cc
@@ -24,7 +24,10 @@ using namespace std;
     X(KWH, GJ, {vto=vfrom*0.0036;}) \
     X(GJ,  KWH,{vto=vfrom/0.0036;}) \
     X(M3,  L,  {vto=vfrom*1000.0;}) \
-    X(L,   M3, {vto=vfrom/1000.0;})
+    X(L,   M3, {vto=vfrom/1000.0;}) \
+    X(C,   F,  {vto=(vfrom*9.0/5.0)+32.0;}) \
+    X(F,   C,  {vto=(vfrom-32)*5.0/9.0;}) \
+
 
 bool canConvert(Unit ufrom, Unit uto)
 {
diff --git a/src/units.h b/src/units.h
index 53a51bc..cf52ec7 100644
--- a/src/units.h
+++ b/src/units.h
@@ -37,9 +37,10 @@
     X(M3,m3,m3,Volume,"cubic meter")        \
     X(L,l,l,Volume,"litre")                 \
     X(KW,kw,kW,Power,"kilo Watt")           \
-    X(M3H,m3h,m3/h,Flow,"cubic meters per hour")      \
+    X(M3H,m3h,m3/h,Flow,"cubic meters per hour") \
     X(C,c,°C,Temperature,"celsius")         \
-    X(HCA,hca,hca,HCA,"heat cost allocation")              \
+    X(F,f,°F,Temperature,"fahrenheit")      \
+    X(HCA,hca,hca,HCA,"heat cost allocation") \
     X(TXT,txt,txt,Text,"text")              \
 
 enum class Unit
diff --git a/test.sh b/test.sh
index 419dbc1..0bcffaf 100755
--- a/test.sh
+++ b/test.sh
@@ -20,4 +20,5 @@ tests/test_multiple_ids.sh $PROG
 tests/test_conversions.sh $PROG
 #tests/test_oneshot.sh $PROG broken test
 tests/test_wrongkeys.sh $PROG
+tests/test_config4.sh $PROG
 tests/test_rtlwmbus.sh $PROG
diff --git a/tests/config4/etc/wmbusmeters.conf b/tests/config4/etc/wmbusmeters.conf
new file mode 100644
index 0000000..2e4273b
--- /dev/null
+++ b/tests/config4/etc/wmbusmeters.conf
@@ -0,0 +1,5 @@
+loglevel=normal
+device=simulations/simulation_conversionsadded.txt
+logtelegrams=false
+format=json
+addconversions=GJ,L,F
\ No newline at end of file
diff --git a/tests/config4/etc/wmbusmeters.d/Hettan b/tests/config4/etc/wmbusmeters.d/Hettan
new file mode 100644
index 0000000..b00dfb2
--- /dev/null
+++ b/tests/config4/etc/wmbusmeters.d/Hettan
@@ -0,0 +1,4 @@
+name=Hettan
+type=vario451
+id=58234965
+key=
diff --git a/tests/config4/etc/wmbusmeters.d/MyElectricity b/tests/config4/etc/wmbusmeters.d/MyElectricity
new file mode 100644
index 0000000..b0c18ad
--- /dev/null
+++ b/tests/config4/etc/wmbusmeters.d/MyElectricity
@@ -0,0 +1,4 @@
+name=MyElectricity
+type=omnipower
+id=15947107
+key=
\ No newline at end of file
diff --git a/tests/config4/etc/wmbusmeters.d/MyElement b/tests/config4/etc/wmbusmeters.d/MyElement
new file mode 100644
index 0000000..11a1882
--- /dev/null
+++ b/tests/config4/etc/wmbusmeters.d/MyElement
@@ -0,0 +1,4 @@
+name=MyElement
+type=qcaloric
+id=78563412
+key=
diff --git a/tests/config4/etc/wmbusmeters.d/MyHeater b/tests/config4/etc/wmbusmeters.d/MyHeater
new file mode 100644
index 0000000..cc76f5c
--- /dev/null
+++ b/tests/config4/etc/wmbusmeters.d/MyHeater
@@ -0,0 +1,4 @@
+name=MyHeater
+type=multical302
+id=12345678
+key=
\ No newline at end of file
diff --git a/tests/config4/etc/wmbusmeters.d/MyTapWater b/tests/config4/etc/wmbusmeters.d/MyTapWater
new file mode 100644
index 0000000..806ab1b
--- /dev/null
+++ b/tests/config4/etc/wmbusmeters.d/MyTapWater
@@ -0,0 +1,4 @@
+name=MyTapWater
+type=multical21
+id=76348799
+key=
diff --git a/tests/config4/etc/wmbusmeters.d/Vadden b/tests/config4/etc/wmbusmeters.d/Vadden
new file mode 100644
index 0000000..12dc8b9
--- /dev/null
+++ b/tests/config4/etc/wmbusmeters.d/Vadden
@@ -0,0 +1,4 @@
+name=Vadden
+type=multical21
+id=44556677
+key=
diff --git a/tests/test_config4.sh b/tests/test_config4.sh
new file mode 100755
index 0000000..dde513c
--- /dev/null
+++ b/tests/test_config4.sh
@@ -0,0 +1,22 @@
+#!/bin/bash
+
+PROG="$1"
+TEST=testoutput
+mkdir -p $TEST
+
+cat simulations/simulation_conversionsadded.txt | grep '^{' > $TEST/test_expected.txt
+
+$PROG --useconfig=tests/config4 > $TEST/test_output.txt
+
+if [ "$?" == "0" ]
+then
+    cat $TEST/test_output.txt | sed 's/"timestamp":"....-..-..T..:..:..Z"/"timestamp":"1111-11-11T11:11:11Z"/' > $TEST/test_responses.txt
+    diff $TEST/test_expected.txt $TEST/test_responses.txt
+    if [ "$?" == "0" ]
+    then
+        echo Config4 with addconversions OK
+    fi
+else
+    echo Failure.
+    exit 1
+fi