diff --git a/src/main/java/fr/ifpen/allotropeconverters/gc/chemstation/chfile/ChFile.java b/src/main/java/fr/ifpen/allotropeconverters/gc/chemstation/chfile/ChFile.java
index 40d0742..90ce370 100644
--- a/src/main/java/fr/ifpen/allotropeconverters/gc/chemstation/chfile/ChFile.java
+++ b/src/main/java/fr/ifpen/allotropeconverters/gc/chemstation/chfile/ChFile.java
@@ -23,13 +23,13 @@ public abstract class ChFile {
     protected Double yOffset;
     protected String detector;
 
-    int dataStart;
-    int startTimePosition;
-    int endTimePosition;
-    int unitsPosition;
-    int yOffsetPosition;
-    int yScalingPosition;
-    int detectorPosition;
+    protected final int dataStart; // Has no use for now
+    protected final int startTimePosition;
+    protected final int endTimePosition;
+    protected final int unitsPosition;
+    protected final int yOffsetPosition;
+    protected final int yScalingPosition;
+    protected final int detectorPosition;
 
     protected ChFile(RandomAccessFile input, int dataStart, int startTimePosition, int endTimePosition, int unitsPosition, int yOffsetPosition, int yScalingPosition, int detectorPosition) throws IOException {
         this.dataStart = dataStart;
@@ -46,59 +46,46 @@ protected ChFile(RandomAccessFile input, int dataStart, int startTimePosition, i
 
     protected abstract void parseData(RandomAccessFile input) throws IOException;
 
+    /**
+     * Returns the values found in the .ch file, converted to picoampere as the standard imposes.
+     */
     public List<Double> getValues() {
         return values;
     }
 
-    protected void setValues(List<Double> values) {
-        this.values = values;
-    }
-
     public Float getStartTime() {
         return startTime;
     }
 
-    private void setStartTime(Float startTime) {
-        this.startTime = startTime;
-    }
-
     public Float getEndTime() {
         return endTime;
     }
 
-    private void setEndTime(Float endTime) {
-        this.endTime = endTime;
+    public String getDetector() {
+        return detector;
     }
 
+    /**
+     * Returns the unit found in the .ch file.<br>
+     * Warning: the values stored in this class are converted to picoampere, as the standard imposes.
+     */
     protected Unit<ElectricCurrent> getUnit() {
         return unit;
     }
 
-    public String getUnitSymbol() {
-        return unit.toString();
-    }
-
     private void setUnit(String unit) {
         Unit<? extends Quantity> localUnit = Unit.valueOf(unit);
 
         if (!PICO_AMPERE_UNIT.isCompatible(localUnit)) {
-            throw new IllegalArgumentException("Unsupported unit: " + localUnit);
+            throw new IllegalArgumentException("Unsupported unit: " + unit);
         }
 
         this.unit = localUnit.asType(ElectricCurrent.class);
     }
 
-    public String getDetector() {
-        return detector;
-    }
-
-    private void setDetector(String detector) {
-        this.detector = detector;
-    }
-
     protected void readMetadata(RandomAccessFile input) throws IOException {
-        setStartTime(readMetadataTime(input, startTimePosition));
-        setEndTime(readMetadataTime(input, endTimePosition));
+        startTime = readMetadataTime(input, startTimePosition);
+        endTime = readMetadataTime(input, endTimePosition);
         setUnit(readStringAtPosition(input, unitsPosition, true));
 
         input.seek(yOffsetPosition);
@@ -107,6 +94,6 @@ protected void readMetadata(RandomAccessFile input) throws IOException {
         input.seek(yScalingPosition);
         yScaling = input.readDouble();
 
-        setDetector(readStringAtPosition(input, detectorPosition, true));
+        detector = readStringAtPosition(input, detectorPosition, true);
     }
 }
diff --git a/src/main/java/fr/ifpen/allotropeconverters/gc/chemstation/chfile/ChFile179.java b/src/main/java/fr/ifpen/allotropeconverters/gc/chemstation/chfile/ChFile179.java
index c9bd6ec..23525cf 100644
--- a/src/main/java/fr/ifpen/allotropeconverters/gc/chemstation/chfile/ChFile179.java
+++ b/src/main/java/fr/ifpen/allotropeconverters/gc/chemstation/chfile/ChFile179.java
@@ -4,7 +4,6 @@
 import java.io.IOException;
 import java.io.RandomAccessFile;
 import java.util.ArrayList;
-import java.util.List;
 
 import static fr.ifpen.allotropeconverters.gc.chemstation.chfile.ReadHelpers.readLittleEndianDouble;
 
@@ -29,15 +28,13 @@ protected void parseData(RandomAccessFile input) throws IOException {
             throw new IllegalArgumentException("Input too large to parse");
         }
 
-        List<Double> values = new ArrayList<>((int) numberOfPoints);
-        UnitConverter unitConverter = getUnit().getConverterTo(PICO_AMPERE_UNIT);
+        values = new ArrayList<>((int) numberOfPoints);
+        UnitConverter unitConverter = unit.getConverterTo(PICO_AMPERE_UNIT);
 
         input.seek(DATA_START);
 
         for (int i = 0; i < numberOfPoints; i++) {
             values.add(unitConverter.convert(readLittleEndianDouble(input) * yScaling));
         }
-
-        setValues(values);
     }
 }
diff --git a/src/main/java/fr/ifpen/allotropeconverters/gc/chemstation/chfile/ChFile181.java b/src/main/java/fr/ifpen/allotropeconverters/gc/chemstation/chfile/ChFile181.java
index 19d3577..25d5783 100644
--- a/src/main/java/fr/ifpen/allotropeconverters/gc/chemstation/chfile/ChFile181.java
+++ b/src/main/java/fr/ifpen/allotropeconverters/gc/chemstation/chfile/ChFile181.java
@@ -1,5 +1,6 @@
 package fr.ifpen.allotropeconverters.gc.chemstation.chfile;
 
+import javax.measure.converter.UnitConverter;
 import java.io.EOFException;
 import java.io.IOException;
 import java.io.RandomAccessFile;
@@ -26,6 +27,8 @@ protected void parseData(RandomAccessFile input) throws IOException {
         values = new ArrayList<>();
         long[] buffer = new long[]{0, 0, 0};
 
+        UnitConverter unitConverter = unit.getConverterTo(PICO_AMPERE_UNIT);
+
         boolean endOfFile = false;
 
         while (!endOfFile) {
@@ -41,8 +44,7 @@ protected void parseData(RandomAccessFile input) throws IOException {
                     buffer[1] = 0;
                 }
 
-                values.add(buffer[0] * yScaling + yOffset);
-
+                values.add(unitConverter.convert(buffer[0] * yScaling + yOffset));
             } catch (EOFException e) {
                 endOfFile = true;
             }
diff --git a/src/test/java/fr/ifpen/allotropeconverters/gc/chemstation/chfile/ChFile179Tests.java b/src/test/java/fr/ifpen/allotropeconverters/gc/chemstation/chfile/ChFile179Tests.java
index 73da39e..3b3ed15 100644
--- a/src/test/java/fr/ifpen/allotropeconverters/gc/chemstation/chfile/ChFile179Tests.java
+++ b/src/test/java/fr/ifpen/allotropeconverters/gc/chemstation/chfile/ChFile179Tests.java
@@ -24,6 +24,5 @@ void getVersionReturnsExpected() throws IOException {
         Assertions.assertEquals(2.165234, values.get(0), 0.001);
 
         Assertions.assertEquals(SI.PICO(SI.AMPERE), chFile.getUnit());
-        Assertions.assertEquals("pA", chFile.getUnitSymbol());
     }
 }
diff --git a/src/test/java/fr/ifpen/allotropeconverters/gc/chemstation/chfile/ChFile181Tests.java b/src/test/java/fr/ifpen/allotropeconverters/gc/chemstation/chfile/ChFile181Tests.java
index 8698416..bb6119a 100644
--- a/src/test/java/fr/ifpen/allotropeconverters/gc/chemstation/chfile/ChFile181Tests.java
+++ b/src/test/java/fr/ifpen/allotropeconverters/gc/chemstation/chfile/ChFile181Tests.java
@@ -24,6 +24,5 @@ void getVersionReturnsExpected() throws IOException {
         Assertions.assertEquals(2.1010, values.get(0), 0.001);
 
         Assertions.assertEquals(SI.PICO(SI.AMPERE), chFile.getUnit());
-        Assertions.assertEquals("pA", chFile.getUnitSymbol());
     }
 }