diff --git a/CHANGELOG.md b/CHANGELOG.md
index 837c848..99b7a0f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,8 +1,9 @@
 # Changelog hmcli
 
-## [v1.2.0 - 2024-06-22]
-### Changed
+## [v1.2.1 - 2024-06-23]
 - renamed from check_hm to hmcli
+- use common.IsNumeric
+- rename Get/SetHMPlugin to Get/SetPlugin
 - update dependencies
 
 ## [v1.1.1 - 2024-05-25]
diff --git a/cmd/datapoint.go b/cmd/datapoint.go
index 01fe1ea..7d0b6cb 100644
--- a/cmd/datapoint.go
+++ b/cmd/datapoint.go
@@ -4,6 +4,8 @@ import (
 	"fmt"
 	"regexp"
 
+	"github.com/tommi2day/gomodules/common"
+
 	"github.com/atc0005/go-nagios"
 	log "github.com/sirupsen/logrus"
 	"github.com/spf13/cobra"
@@ -190,10 +192,10 @@ func datapointCheck(cmd *cobra.Command, _ []string) error {
 		// boolean
 	case "4":
 		// float
-		preparePD = isNumeric(dp.Value)
+		preparePD = common.IsNumeric(dp.Value)
 	case "16":
 		// integer
-		preparePD = isNumeric(dp.Value)
+		preparePD = common.IsNumeric(dp.Value)
 	case "20":
 		// text
 	}
diff --git a/cmd/datapoint_test.go b/cmd/datapoint_test.go
index eed2d39..fe40d5b 100644
--- a/cmd/datapoint_test.go
+++ b/cmd/datapoint_test.go
@@ -73,7 +73,7 @@ func TestDatapoint(t *testing.T) {
 		}
 		p := nagios.NewPlugin()
 		p.SkipOSExit()
-		SetHmPlugin(p)
+		SetPlugin(p)
 		out, err := common.CmdRun(RootCmd, args)
 		assert.NoErrorf(t, err, "datapoint check command should not return an error:%s", err)
 		assert.NotEmpty(t, out, "datapoint check command should not return an empty string")
@@ -95,7 +95,7 @@ func TestDatapoint(t *testing.T) {
 		}
 		p := nagios.NewPlugin()
 		p.SkipOSExit()
-		SetHmPlugin(p)
+		SetPlugin(p)
 		out, err := common.CmdRun(RootCmd, args)
 		assert.NoErrorf(t, err, "datapoint command should not return an error:%s", err)
 		assert.NotEmpty(t, out, "datapoint command should not return an empty string")
@@ -116,7 +116,7 @@ func TestDatapoint(t *testing.T) {
 		}
 		p := nagios.NewPlugin()
 		p.SkipOSExit()
-		SetHmPlugin(p)
+		SetPlugin(p)
 		out, err := common.CmdRun(RootCmd, args)
 		assert.Errorf(t, err, "datapoint command should not return an error:%s", err)
 		assert.Containsf(t, out, "UNKNOWN: datapoint id 4743 not found",
diff --git a/cmd/mastervalues.go b/cmd/mastervalues.go
index 368c14b..3473598 100644
--- a/cmd/mastervalues.go
+++ b/cmd/mastervalues.go
@@ -7,6 +7,7 @@ import (
 	"github.com/atc0005/go-nagios"
 	log "github.com/sirupsen/logrus"
 	"github.com/spf13/cobra"
+	"github.com/tommi2day/gomodules/common"
 	"github.com/tommi2day/gomodules/hmlib"
 )
 
@@ -238,7 +239,7 @@ func mastervalueCheck(cmd *cobra.Command, _ []string) error {
 	output := fmt.Sprintf("%s=%s", n, v)
 
 	// prepare performance data only for numeric values
-	preparePD := isNumeric(v)
+	preparePD := common.IsNumeric(v)
 	log.Debugf("value is numeric: %v", preparePD)
 	var performanceData []nagios.PerformanceData
 	if preparePD {
diff --git a/cmd/mastervalues_test.go b/cmd/mastervalues_test.go
index a626532..e2b1575 100644
--- a/cmd/mastervalues_test.go
+++ b/cmd/mastervalues_test.go
@@ -74,7 +74,7 @@ func TestMasterValues(t *testing.T) {
 		}
 		p := nagios.NewPlugin()
 		p.SkipOSExit()
-		SetHmPlugin(p)
+		SetPlugin(p)
 		out, err := common.CmdRun(RootCmd, args)
 		assert.NoErrorf(t, err, "mastervalues command should not return an error:%s", err)
 		assert.NotEmpty(t, out, "mastervalues command should not return an empty string")
@@ -97,7 +97,7 @@ func TestMasterValues(t *testing.T) {
 		}
 		p := nagios.NewPlugin()
 		p.SkipOSExit()
-		SetHmPlugin(p)
+		SetPlugin(p)
 		out, err := common.CmdRun(RootCmd, args)
 		assert.NoErrorf(t, err, "mastervalues command should not return an error:%s", err)
 		assert.NotEmpty(t, out, "mastervalues command should not return an empty string")
@@ -119,7 +119,7 @@ func TestMasterValues(t *testing.T) {
 		}
 		p := nagios.NewPlugin()
 		p.SkipOSExit()
-		SetHmPlugin(p)
+		SetPlugin(p)
 		out, err := common.CmdRun(RootCmd, args)
 		assert.Errorf(t, err, "mastervalues command should not return an error:%s", err)
 		assert.Containsf(t, out, "device with id 4743 not in response",
diff --git a/cmd/nagios.go b/cmd/nagios.go
index 5747d10..07aa26c 100644
--- a/cmd/nagios.go
+++ b/cmd/nagios.go
@@ -1,13 +1,11 @@
 package cmd
 
 import (
-	"regexp"
-
 	"github.com/atc0005/go-nagios"
 	log "github.com/sirupsen/logrus"
 )
 
-var hmPlugin = nagios.NewPlugin()
+var plugin = nagios.NewPlugin()
 
 const (
 	stateOK       = "OK"
@@ -18,7 +16,7 @@ const (
 
 // NagiosResult is a helper function to return a nagios plugin result
 func NagiosResult(status string, output string, longOutput string, perfdata []nagios.PerformanceData) *nagios.Plugin {
-	p := GetHmPlugin()
+	p := GetPlugin()
 
 	// Second, immediately defer ReturnCheckResults() so that it runs as the
 	// last step in your client code. If you do not defer ReturnCheckResults()
@@ -71,18 +69,12 @@ func NagiosResult(status string, output string, longOutput string, perfdata []na
 	return p
 }
 
-// SetHmPlugin sets the nagios plugin for the library
-func SetHmPlugin(plugin *nagios.Plugin) {
-	hmPlugin = plugin
-}
-
-// GetHmPlugin returns the nagios plugin for the library
-func GetHmPlugin() *nagios.Plugin {
-	return hmPlugin
+// SetPlugin sets the nagios plugin for the library
+func SetPlugin(p *nagios.Plugin) {
+	plugin = p
 }
 
-func isNumeric(s string) bool {
-	re := regexp.MustCompile(`^[+-\\d.]+$`)
-	r := re.MatchString(s)
-	return r
+// GetPlugin returns the nagios plugin for the library
+func GetPlugin() *nagios.Plugin {
+	return plugin
 }
diff --git a/cmd/nagios_test.go b/cmd/nagios_test.go
index c42a9ae..d5cd46a 100644
--- a/cmd/nagios_test.go
+++ b/cmd/nagios_test.go
@@ -31,7 +31,7 @@ func TestNagios(t *testing.T) {
 
 	for _, tt := range tests {
 		checkHM := nagios.NewPlugin()
-		SetHmPlugin(checkHM)
+		SetPlugin(checkHM)
 		checkHM.SkipOSExit()
 		t.Run(tt.name, func(t *testing.T) {
 			p := NagiosResult(tt.status, "no notifications", "", tt.perfdata)
@@ -44,26 +44,3 @@ func TestNagios(t *testing.T) {
 		})
 	}
 }
-
-func TestIsNumeric(t *testing.T) {
-	tests := []struct {
-		name     string
-		input    string
-		expected bool
-	}{
-		{"isNumeric", "123", true},
-		{"isNumericFloat", "123.456", true},
-		{"isNumericNegative", "-123", true},
-		{"isNumericNegativeFloat", "+123.456", true},
-		{"isNumericEmpty", "", false},
-		{"isNumericString", "abc", false},
-		{"isNumericStringWithNumber", "abc123", false},
-		{"isNumericStringWithNumberNegative", "abc-123", false},
-	}
-
-	for _, tt := range tests {
-		t.Run(tt.name, func(t *testing.T) {
-			assert.Equal(t, tt.expected, isNumeric(tt.input), "isNumeric should return %v", tt.expected)
-		})
-	}
-}
diff --git a/cmd/notification.go b/cmd/notification.go
index a669872..51aa70d 100644
--- a/cmd/notification.go
+++ b/cmd/notification.go
@@ -42,7 +42,7 @@ func getNotifications(cmd *cobra.Command, _ []string) error {
 			return fmt.Errorf("cannot compile ignore regexp: %v", err)
 		}
 	}
-	p := GetHmPlugin()
+	p := GetPlugin()
 	_, err = hmlib.GetDeviceList("", false)
 	if err != nil {
 		return err
diff --git a/cmd/notification_test.go b/cmd/notification_test.go
index 51242b9..2e90427 100644
--- a/cmd/notification_test.go
+++ b/cmd/notification_test.go
@@ -43,7 +43,7 @@ func TestNotifications(t *testing.T) {
 			"--unit-test",
 		}
 		p := nagios.NewPlugin()
-		SetHmPlugin(p)
+		SetPlugin(p)
 		p.SkipOSExit()
 		out, err := common.CmdRun(RootCmd, args)
 		assert.NoErrorf(t, err, "notifications command should not return an error:%s", err)
@@ -61,7 +61,7 @@ func TestNotifications(t *testing.T) {
 			"--unit-test",
 		}
 		p := nagios.NewPlugin()
-		SetHmPlugin(p)
+		SetPlugin(p)
 		p.SkipOSExit()
 		out, err := common.CmdRun(RootCmd, args)
 		assert.NoErrorf(t, err, "notifications command should not return an error:%s", err)
diff --git a/cmd/rootcmd.go b/cmd/rootcmd.go
index 5ca89fa..6f46227 100644
--- a/cmd/rootcmd.go
+++ b/cmd/rootcmd.go
@@ -65,7 +65,7 @@ func init() {
 func Execute() {
 	if err := RootCmd.Execute(); err != nil {
 		fmt.Println(err)
-		p := GetHmPlugin()
+		p := GetPlugin()
 		p.Errors = append(p.Errors, err)
 		log.Debugf("return UNKNOWN, errors: %v", p.Errors)
 		NagiosResult("UNKNOWN", "", "", nil)
diff --git a/cmd/sysvar.go b/cmd/sysvar.go
index 74ebb84..7645ab7 100644
--- a/cmd/sysvar.go
+++ b/cmd/sysvar.go
@@ -7,6 +7,7 @@ import (
 	"github.com/atc0005/go-nagios"
 	log "github.com/sirupsen/logrus"
 	"github.com/spf13/cobra"
+	"github.com/tommi2day/gomodules/common"
 	"github.com/tommi2day/gomodules/hmlib"
 )
 
@@ -107,7 +108,7 @@ func sysvarCheck(cmd *cobra.Command, _ []string) error {
 	output := fmt.Sprintf("%s=%s (%s)", entry.Name, v, entry.Unit)
 
 	// prepare performance data if value is numeric
-	preparePD := isNumeric(v)
+	preparePD := common.IsNumeric(v)
 	log.Debugf("value is numeric: %v", preparePD)
 	var performanceData []nagios.PerformanceData
 	if preparePD {
diff --git a/cmd/sysvar_test.go b/cmd/sysvar_test.go
index bc83ca4..d0ff310 100644
--- a/cmd/sysvar_test.go
+++ b/cmd/sysvar_test.go
@@ -67,7 +67,7 @@ func TestSysvar(t *testing.T) {
 		}
 
 		p := nagios.NewPlugin()
-		SetHmPlugin(p)
+		SetPlugin(p)
 		p.SkipOSExit()
 		out, err := common.CmdRun(RootCmd, args)
 		assert.NoErrorf(t, err, "sysvars command should not return an error:%s", err)
@@ -97,7 +97,7 @@ func TestSysvar(t *testing.T) {
 		}
 
 		p := nagios.NewPlugin()
-		SetHmPlugin(p)
+		SetPlugin(p)
 		p.SkipOSExit()
 		out, err := common.CmdRun(RootCmd, args)
 		assert.NoErrorf(t, err, "sysvars command should not return an error:%s", err)