diff --git a/Tests/HelperTests/UtilsTest.cs b/Tests/HelperTests/UtilsTest.cs
index ce74774..2fd652c 100644
--- a/Tests/HelperTests/UtilsTest.cs
+++ b/Tests/HelperTests/UtilsTest.cs
@@ -100,5 +100,40 @@ namespace Tests.HelperTests {
                 Assert.That(Utils.SplitName("ABC GesbR", "Bauer"), Is.EqualTo(((string, string?))("ABC GesbR", null)));
             });
         }
+
+        [Test]
+        public void Test_CalcCrc16Modbus() {
+            Assert.Multiple(() => {
+                Assert.That(Utils.CalcCrc16Modbus(""), Is.EqualTo(0xFFFF));
+                Assert.That(Utils.CalcCrc16Modbus("abcd"), Is.EqualTo(0x1D97));
+                Assert.That(Utils.CalcCrc16Modbus("ABCD"), Is.EqualTo(0x0F85));
+                // Matzen (SysTec IT3000A)
+                Assert.That(Utils.CalcCrc16Modbus("000011.08.2319:03   01       0       0       0kg     1"), Is.EqualTo(43166));
+                Assert.That(Utils.CalcCrc16Modbus("000011.08.2319:04   01       0       0       0kg     1"), Is.EqualTo(21615));
+                Assert.That(Utils.CalcCrc16Modbus("000011.08.2319:05   01       0       0       0kg     1"), Is.EqualTo(40446));
+                Assert.That(Utils.CalcCrc16Modbus("000011.08.2319:06   01       0       0       0kg     1"), Is.EqualTo(34638));
+                Assert.That(Utils.CalcCrc16Modbus("000011.08.2319:07   01       0       0       0kg     1"), Is.EqualTo(20191));
+                Assert.That(Utils.CalcCrc16Modbus("000011.08.2319:08   01       0       0       0kg     1"), Is.EqualTo(16047));
+                Assert.That(Utils.CalcCrc16Modbus("000011.08.2319:09   01       0       0       0kg     1"), Is.EqualTo(63294));
+                Assert.That(Utils.CalcCrc16Modbus("000011.08.2319:10   01       0       0       0kg     1"), Is.EqualTo(7718));
+                Assert.That(Utils.CalcCrc16Modbus("000011.08.2319:12   01       0       0       0kg     1"), Is.EqualTo(52487));
+                // Wolkersdorf, Waage 1 (SysTec IT6000E)
+                Assert.That(Utils.CalcCrc16Modbus("000004.09.2315:50   51       0       0       0kg     A"), Is.EqualTo(10187));
+                Assert.That(Utils.CalcCrc16Modbus("000004.09.2315:50   61       0       0       0kg     A"), Is.EqualTo(20683));
+                Assert.That(Utils.CalcCrc16Modbus("000004.09.2315:50   71       0       0       0kg     A"), Is.EqualTo(48586));
+                Assert.That(Utils.CalcCrc16Modbus("000004.09.2315:50   81       0       0       0kg     A"), Is.EqualTo(22217));
+                Assert.That(Utils.CalcCrc16Modbus("000004.09.2315:50   91       0       0       0kg     A"), Is.EqualTo(48072));
+                Assert.That(Utils.CalcCrc16Modbus("000004.09.2315:51  101       0       0       0kg     A"), Is.EqualTo(30119));
+                Assert.That(Utils.CalcCrc16Modbus("000004.09.2315:51  111       0       0       0kg     A"), Is.EqualTo(39078));
+                // Wolkersdorf, Waage 2 (SysTec IT6000E)
+                Assert.That(Utils.CalcCrc16Modbus("000004.09.2315:51   41       0       0       0kg     B"), Is.EqualTo(539));
+                Assert.That(Utils.CalcCrc16Modbus("000004.09.2315:51   51       0       0       0kg     B"), Is.EqualTo(61210));
+                Assert.That(Utils.CalcCrc16Modbus("000004.09.2315:51   61       0       0       0kg     B"), Is.EqualTo(38938));
+                Assert.That(Utils.CalcCrc16Modbus("000004.09.2315:51   71       0       0       0kg     B"), Is.EqualTo(29979));
+                Assert.That(Utils.CalcCrc16Modbus("000004.09.2315:51   81       0       0       0kg     B"), Is.EqualTo(40472));
+                Assert.That(Utils.CalcCrc16Modbus("000004.09.2315:51   91       0       0       0kg     B"), Is.EqualTo(29465));
+                Assert.That(Utils.CalcCrc16Modbus("000004.09.2315:51  101       0       0       0kg     B"), Is.EqualTo(29927));
+            });
+        }
     }
 }