diff --git a/lib/plugins/Invoke-IcingaCheckCheckSum.psm1 b/lib/plugins/Invoke-IcingaCheckCheckSum.psm1
new file mode 100644
index 0000000..1d2cc02
--- /dev/null
+++ b/lib/plugins/Invoke-IcingaCheckCheckSum.psm1
@@ -0,0 +1,65 @@
+<#
+.SYNOPSIS
+   Checks hash against filehash of a file
+.DESCRIPTION
+   Invoke-IcingaCheckCheckSum returns either 'OK' or 'CRITICAL', whether the check matches or not.
+
+   More Information on https://github.com/LordHepipud/icinga-module-windows
+.FUNCTIONALITY
+   This module is intended to be used to check a hash against a filehash of a file, to determine whether changes have occured.
+   Based on the match result the status will change between 'OK' or 'CRITICAL'. The function will return one of these given codes.
+.EXAMPLE
+   PS> Invoke-IcingaCheckCheckSum -Path "C:\Users\Icinga\Downloads\test.txt"
+   [OK] CheckSum C:\Users\Icinga\Downloads\test.txt is 008FB84A017F5DFDAF038DB2FDD6934E6E5D9CD3C7AACE2F2168D7D93AF51E4B
+   |0
+.EXAMPLE
+   PS> Invoke-IcingaCheckCheckSum -Path "C:\Users\Icinga\Downloads\test.txt" -Hash 008FB84A017F5DFDAF038DB2FDD6934E6E5D9CD3C7AACE2F2168D7D93AF51E4B
+   [OK] CheckSum C:\Users\Icinga\Downloads\test.txt is 008FB84A017F5DFDAF038DB2FDD6934E6E5D9CD3C7AACE2F2168D7D93AF51E4B|
+   0
+.EXAMPLE
+   PS> Invoke-IcingaCheckCheckSum -Path "C:\Users\Icinga\Downloads\test.txt" -Hash 008FB84A017F5DFDAF038DB2FDD6934E6E5D
+   [CRITICAL] CheckSum C:\Users\Icinga\Downloads\test.txt 008FB84A017F5DFDAF038DB2FDD6934E6E5D9CD3C7AACE2F2168D7D93AF51E4B is not matching 008FB84A017F5DFDAF038DB2FDD6934E6E5D
+   | 
+   2
+.PARAMETER WarningBytes
+   Used to specify a string to the path of a file, which will be checked.
+
+   The string has to be like "C:\Users\Icinga\test.txt"
+
+.PARAMETER Algorithm
+   Used to specify a string, which contains the algorithm to be used.
+
+   Allowed algorithms: 'SHA1', 'SHA256', 'SHA384', 'SHA512', 'MD5'
+
+.INPUTS
+   System.String
+
+.OUTPUTS
+   System.String
+
+.LINK
+   https://github.com/LordHepipud/icinga-module-windows
+.NOTES
+#>
+
+function Invoke-IcingaCheckCheckSum()
+{
+    param(
+        [string]$Path       = $null,
+        [ValidateSet]('SHA1', 'SHA256', 'SHA384', 'SHA512', 'MD5')
+        [string]$Algorithm  = 'SHA256',
+        [string]$Hash       = $null,
+        [switch]$NoPerfData,
+        [ValidateSet(0, 1, 2, 3)]
+        [int]$Verbosity     = 0
+    );
+
+        [string]$FileHash      = (Get-FileHash $Path -Algorithm $Algorithm).Hash
+        $CheckSumCheck = New-IcingaCheck -Name "CheckSum $Path" -Value $FileHash;
+
+        If(([string]::IsNullOrEmpty($Hash)) -eq $FALSE){
+            $CheckSumCheck.CritIfNotMatch($Hash) | Out-Null;
+        }
+
+    return (New-IcingaCheckresult -Check $CheckSumCheck -NoPerfData $NoPerfData -Compile);
+}
\ No newline at end of file
diff --git a/lib/plugins/Invoke-IcingaCheckMemory.psm1 b/lib/plugins/Invoke-IcingaCheckMemory.psm1
index 230f510..210f109 100644
--- a/lib/plugins/Invoke-IcingaCheckMemory.psm1
+++ b/lib/plugins/Invoke-IcingaCheckMemory.psm1
@@ -52,10 +52,6 @@ Import-IcingaLib core\tools;
 .NOTES
 #>
 
-<#
-if ($bytes > 1099511627776) { return sprintf('%.2f TB', $bytes / 1099511627776); } elseif ($bytes > 1073741824) { return sprintf('%.2f GB', $bytes / 1073741824); } elseif ($bytes > 1048576) { return sprintf('%.2f MB', $bytes / 1048576); } else { return sprintf('%.2f KB', $bytes / 1024);
-#>
-
 function Invoke-IcingaCheckMemory()
 {
     param(
@@ -104,8 +100,6 @@ function Invoke-IcingaCheckMemory()
    #$MemoryByteAvailable    = New-IcingaCheck -Name "Available Bytes" -Value $MemoryData['Memory Available Bytes'] -Unit 'B';
    #$PageFileCheck          = New-IcingaCheck -Name 'PageFile Percent' -Value $MemoryData['PageFile %'] -Unit '%';
 
-
-   #Kommastellen bedenken!
    # PageFile To-Do
    $MemoryByteUsed.WarnOutOfRange($WarningConverted).CritOutOfRange($CrticalConverted) | Out-Null;
    $MemoryPerc.WarnOutOfRange($WarningPercent).CritOutOfRange($CriticalPercent) | Out-Null;
@@ -113,7 +107,6 @@ function Invoke-IcingaCheckMemory()
    $MemoryPackage.AddCheck($MemoryPerc);
    #$MemoryPackage.AddCheck($MemoryByteAvailable);
    $MemoryPackage.AddCheck($MemoryByteUsed);
-
    #$MemoryPackage.AddCheck($PageFileCheck);
     
    return (New-IcingaCheckResult -Check $MemoryPackage -NoPerfData $NoPerfData -Compile);