diff --git a/renderer/__init__.py b/renderer/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/renderer/__main__.py b/renderer/__main__.py
deleted file mode 100644
index b8a5ddf..0000000
--- a/renderer/__main__.py
+++ /dev/null
@@ -1,8 +0,0 @@
-import sys
-
-import mistletoe
-from fifty_ohm_html_renderer import FiftyOhmHtmlRenderer
-
-if __name__ == "__main__":
-    with open(sys.argv[1]) as fin, open(sys.argv[2], "w") as fout:
-        fout.write(mistletoe.markdown(fin, FiftyOhmHtmlRenderer))
diff --git a/renderer/fifty_ohm_html_renderer.py b/renderer/fifty_ohm_html_renderer.py
index de7bbe2..b65dea4 100644
--- a/renderer/fifty_ohm_html_renderer.py
+++ b/renderer/fifty_ohm_html_renderer.py
@@ -7,17 +7,35 @@ from renderer.dash import Dash
 from renderer.halfwidth_spaces import HalfwidthSpaces
 from renderer.nonbreaking_spaces import NonbreakingSpaces, NonbreakingSpacesDots
 from renderer.quote import Quote
+from renderer.references import References
 from renderer.tag import Tag
 from renderer.underline import Underline
+from renderer.unit import Unit
 
 
 class FiftyOhmHtmlRenderer(HtmlRenderer):
-
     margin_anchor_id = 0
     margin_id = 0
+    section_url = "section.html"
+    ref_id = 0
 
     def __init__(self):
-        super().__init__(Dash, BlockComment, SpanComment, Quote, Underline, Tag, HalfwidthSpaces, NonbreakingSpaces, NonbreakingSpacesDots)
+        super().__init__(
+            Dash,
+            BlockComment,
+            SpanComment,
+            Quote,
+            Unit,
+            Underline,
+            Tag,
+            HalfwidthSpaces,
+            NonbreakingSpaces,
+            NonbreakingSpacesDots,
+            HalfwidthSpaces,
+            NonbreakingSpaces,
+            NonbreakingSpacesDots,
+            References,
+        )
 
     def render_dash(self, token):
         return " – "
@@ -34,15 +52,40 @@ class FiftyOhmHtmlRenderer(HtmlRenderer):
     def render_underline(self, token):
         return f"<u>{self.render_inner(token)}</u>"
 
+    @classmethod
+    def render_unit(cls, token: Unit):
+        unit = token.prefix + cls.convert_unit_helper(token.unit)
+        if token.unit in ["°", "%"]:
+            # Special cases with no space between value and unit.
+            return f"{token.value}{unit}"
+        else:
+            # Default case is rendered with a narrow no-break space.
+            return f"{token.value}&#8239;{unit}"
+
+    units = {
+        "Ohm": "Ω",
+    }
+
+    @classmethod
+    def convert_unit_helper(cls, unit: str) -> str:
+        """Converts human-typable units to their preferred representation.
+
+        :param str unit: The unit to convert
+        """
+        if unit in cls.units.keys():
+            return cls.units[unit]
+        else:
+            return unit
+
     def render_thematic_break(self, token):
         self.margin_anchor_id += 1
         return f'<a id="margin_{self.margin_anchor_id}"></a>'
 
     @staticmethod
     def render_tag_helper(type, content, margin_id, margin_anchor_id):
-        """ This function is used to render the different types of tags. It is
-        used in the HtmlRenderer class and also in the test class """
-        return textwrap.dedent(f'''\
+        """This function is used to render the different types of tags. It is
+        used in the HtmlRenderer class and also in the test class"""
+        return textwrap.dedent(f"""\
             <div class="margin {type}" id="margin_for_{margin_id}">
                 {content}
             </div>
@@ -62,33 +105,29 @@ class FiftyOhmHtmlRenderer(HtmlRenderer):
                 moveFunc();
             }})();
             </script>
-        ''')
+        """)
 
     def render_tag(self, token):
-        if(token.tagtype == "latexonly"):
+        if token.tagtype == "latexonly":
             return ""
-        elif(token.tagtype == "webonly"):
+        elif token.tagtype == "webonly":
             return self.render_inner(token)
 
         self.margin_id += 1
 
-        if(token.tagtype == "webmargin"):
+        if token.tagtype == "webmargin":
             type = "margin"
-        elif(token.tagtype == "webtip"):
+        elif token.tagtype == "webtip":
             type = "tip"
-        elif(token.tagtype == "webindepth"):
+        elif token.tagtype == "webindepth":
             type = "indepth"
-        else :
+        else:
             type = token.tagtype
 
         return self.render_tag_helper(
-            type,
-            self.render_inner(token),
-            self.margin_id,
-            self.margin_anchor_id
+            type, self.render_inner(token), self.margin_id, self.margin_anchor_id
         )
-    
-    
+
     def render_halfwidth_spaces(self, token):
         return f"{token.first}.&#8239;{token.second}."
 
@@ -96,8 +135,8 @@ class FiftyOhmHtmlRenderer(HtmlRenderer):
         return f"{token.first}&#160;{token.second}"
 
     def render_nonbreaking_spaces_dots(self, token):
-        lookup = {
-            "" : "",
-            " " : "&#160;"
-        }
-        return f"{lookup[token.first]}{token.second}{lookup[token.third]}"
\ No newline at end of file
+        lookup = {"": "", " ": "&#160;"}
+        return f"{lookup[token.first]}{token.second}{lookup[token.third]}"
+
+    def render_references(self, token):
+        return f'<a href="{self.section_url}#ref_{token.first}" onclick="highlightRef(\'{token.first}\');">{self.ref_id}</a>'
diff --git a/renderer/halfwidth_spaces.py b/renderer/halfwidth_spaces.py
index f9daf9b..dfdd374 100644
--- a/renderer/halfwidth_spaces.py
+++ b/renderer/halfwidth_spaces.py
@@ -8,7 +8,7 @@ class HalfwidthSpaces(SpanToken):
     Insert halfwidth space into span token (Z. B.)
     Identifies "z.B.", "d.h." and "D.h." with and without space in between.
     """
-    pattern = re.compile(r"\b(z|d|D)\.(B|h)\.")
+    pattern = re.compile(r"\b(z|Z|d|D)\.\s?(B|h)\.")
 
     def __init__(self, match_object):
         self.first = match_object.group(1)
diff --git a/renderer/nonbreaking_spaces.py b/renderer/nonbreaking_spaces.py
index 932653f..08ac99d 100644
--- a/renderer/nonbreaking_spaces.py
+++ b/renderer/nonbreaking_spaces.py
@@ -6,7 +6,7 @@ from mistletoe.span_token import SpanToken
 class NonbreakingSpaces(SpanToken):
     """
     Insert unbreakable space into span token (§ 3)
-    Identifies "§$number", "Abs.$number", "Klasse [A,E,N]" w/ and w\ space between.
+    Identifies "§$number", "Abs.$number", "Klasse [A,E,N]" w/ and without space between.
     """
     pattern = re.compile(r"(§|Abs\.|Klasse)\s?(\d|[NEA])")
 
diff --git a/renderer/references.py b/renderer/references.py
new file mode 100644
index 0000000..e8b5f18
--- /dev/null
+++ b/renderer/references.py
@@ -0,0 +1,15 @@
+import re
+
+from mistletoe.span_token import SpanToken
+
+
+class References(SpanToken):
+    """
+    Resolve references for html
+    Identifies "[ref:$]"
+    """
+    pattern = re.compile(r"\[ref\:(\S+)\]")
+
+    def __init__(self, match_object):
+        self.first = match_object.group(1)
+
diff --git a/renderer/unit.py b/renderer/unit.py
new file mode 100644
index 0000000..4a6b9f0
--- /dev/null
+++ b/renderer/unit.py
@@ -0,0 +1,55 @@
+import re
+
+from mistletoe.span_token import SpanToken
+
+
+class Unit(SpanToken):
+    units = [
+        "A",
+        "Ah",
+        "A/mm²",
+        "baud",
+        "Bit",
+        "Bit/s",
+        "dB",
+        "dBi",
+        "dBm",
+        "dBW",
+        "F",
+        "J",
+        "Hz",
+        "H",
+        "cm",
+        "m",
+        "m²",
+        "Ohm",
+        "ppm",
+        "pps",
+        "s",
+        "V",
+        "W",
+        "Wh",
+        "°",
+        "%",
+    ]
+    prefixes = ["p", "n", "μ", "m", "k", "M", "G"]
+
+    pattern = re.compile(
+        r"(?P<value>[0-9,]+) ?(?P<prefix>"
+        # Group all prefixes together in a capture group
+        # Empty string at end of list is required so the group always exists in the resulting match
+        + "|".join(prefixes + [""])
+        + ")(?P<unit>"
+        # Group all units together in a capture group.
+        + "|".join(units)
+        + r")(?!\w)"
+    )
+
+    value: str
+    prefix: str
+    unit: str
+
+    def __init__(self, match: re.Match):
+        self.value = match.group("value")
+        self.prefix = match.group("prefix") or ""
+        self.unit = match.group("unit")
diff --git a/test/test_halfwidth_spaces.py b/test/test_halfwidth_spaces.py
index 0438674..1d3c4f9 100644
--- a/test/test_halfwidth_spaces.py
+++ b/test/test_halfwidth_spaces.py
@@ -3,8 +3,13 @@ import mistletoe
 from renderer.fifty_ohm_html_renderer import FiftyOhmHtmlRenderer
 from test.util import paragraph
 
-def test_halfwidth_space_html():
-    input = "Dies ist z.B. ein Test. D.h. hier sollten d.h. Spaces ersetzt worden sein."
-    target = "Dies ist z.&#8239;B. ein Test. D.&#8239;h. hier sollten d.&#8239;h. Spaces ersetzt worden sein."
 
-    assert mistletoe.markdown(input, FiftyOhmHtmlRenderer) == paragraph(target)
+def test_halfwidth_space_html():
+    assertions = {
+        "Dies ist z.B. ein Test. D.h. hier sollten d.h. Spaces ersetzt worden sein." : "Dies ist z.&#8239;B. ein Test. D.&#8239;h. hier sollten d.&#8239;h. Spaces ersetzt worden sein.",
+        "Dies ist z. B. ein Test. D. h. hier sollten d. h. Spaces ersetzt worden sein." : "Dies ist z.&#8239;B. ein Test. D.&#8239;h. hier sollten d.&#8239;h. Spaces ersetzt worden sein.",
+        "Z. B. die D.B. wird auch ersetzt, aber das macht nix." : "Z.&#8239;B. die D.&#8239;B. wird auch ersetzt, aber das macht nix."
+    }
+    
+    for key, value in assertions.items():
+        assert mistletoe.markdown(key, FiftyOhmHtmlRenderer) == paragraph(value)
diff --git a/test/test_references.py b/test/test_references.py
new file mode 100644
index 0000000..80dff9d
--- /dev/null
+++ b/test/test_references.py
@@ -0,0 +1,17 @@
+import mistletoe
+
+from renderer.fifty_ohm_html_renderer import FiftyOhmHtmlRenderer
+from test.util import paragraph
+
+
+def test_references_html():
+    # Right now this tests only the default values.
+    # The correct behavior can be tested when the information is added to the renderer class
+    assertions = {
+        "[ref:e_oszilloskop_bildschirmfoto_sinus]": '<a href="section.html#ref_e_oszilloskop_bildschirmfoto_sinus" onclick="highlightRef(\'e_oszilloskop_bildschirmfoto_sinus\');">0</a>',
+        "[ref:n_rst_r]": '<a href="section.html#ref_n_rst_r" onclick="highlightRef(\'n_rst_r\');">0</a>',
+        "[ref:Uuuuuh]": '<a href="section.html#ref_Uuuuuh" onclick="highlightRef(\'Uuuuuh\');">0</a>',  # Test the default parameters
+    }
+
+    for key, value in assertions.items():
+        assert mistletoe.markdown(key, FiftyOhmHtmlRenderer) == paragraph(value)
diff --git a/test/test_unit.py b/test/test_unit.py
new file mode 100644
index 0000000..eb736cd
--- /dev/null
+++ b/test/test_unit.py
@@ -0,0 +1,45 @@
+import mistletoe
+import pytest
+
+from renderer.fifty_ohm_html_renderer import FiftyOhmHtmlRenderer
+
+from .util import paragraph
+
+
+@pytest.mark.html
+def test_basic_units_html():
+    """Test basic units: Insert non-breaking, smaller space."""
+    assertions = {
+        "1 V": "1&#8239;V",
+        "0,12 V": "0,12&#8239;V",
+        "0,75 kW": "0,75&#8239;kW",
+        "33 A": "33&#8239;A",
+        "1 Ah": "1&#8239;Ah",  # Ah can be a tricky case if the RegEx is wrong, as A might match before Ah, thus rendering the output with an "A" unit
+    }
+
+    for input, output in assertions.items():
+        assert mistletoe.markdown(input, FiftyOhmHtmlRenderer) == paragraph(output)
+
+
+@pytest.mark.html
+def test_translated_units_html():
+    """Test translated units: Replace Ohm with Ω."""
+    assertions = {
+        "50 Ohm": "50&#8239;Ω",
+        "100 mOhm": "100&#8239;mΩ",
+    }
+
+    for input, output in assertions.items():
+        assert mistletoe.markdown(input, FiftyOhmHtmlRenderer) == paragraph(output)
+
+
+@pytest.mark.html
+def test_special_units_html():
+    """Test special units: Don't put space before ° and %."""
+    assertions = {
+        "100%": "100%",
+        "42,24°": "42,24°",
+    }
+
+    for input, output in assertions.items():
+        assert mistletoe.markdown(input, FiftyOhmHtmlRenderer) == paragraph(output)
diff --git a/test/util.py b/test/util.py
index f30aa79..a86b9eb 100644
--- a/test/util.py
+++ b/test/util.py
@@ -1,2 +1,2 @@
-def paragraph(text) :
-    return f'<p>{text}</p>\n'
\ No newline at end of file
+def paragraph(text):
+    return f"<p>{text}</p>\n"