diff --git a/local-storage/index.js b/local-storage/index.js
index 5fff233..e64bc18 100644
--- a/local-storage/index.js
+++ b/local-storage/index.js
@@ -1,11 +1,17 @@
 import { AsyncStorage } from 'react-native'
+import Observable from 'obv'
 
-export async function getTempScale() {
+export const tempScaleObservable = Observable()
+getTempScale()
+
+async function getTempScale() {
   const result = await AsyncStorage.getItem('tempScale')
   if (!result) return result
-  return JSON.parse(result)
+  tempScaleObservable.set(JSON.parse(result))
 }
 
 export async function saveTempScale(scale) {
-  return AsyncStorage.setItem('tempScale', JSON.stringify(scale))
+  await AsyncStorage.setItem('tempScale', JSON.stringify(scale))
+  tempScaleObservable.set(scale)
 }
+
diff --git a/package-lock.json b/package-lock.json
index 66bd9e7..2df2c48 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -3732,8 +3732,7 @@
         },
         "ansi-regex": {
           "version": "2.1.1",
-          "bundled": true,
-          "optional": true
+          "bundled": true
         },
         "aproba": {
           "version": "1.2.0",
@@ -3751,13 +3750,11 @@
         },
         "balanced-match": {
           "version": "1.0.0",
-          "bundled": true,
-          "optional": true
+          "bundled": true
         },
         "brace-expansion": {
           "version": "1.1.11",
           "bundled": true,
-          "optional": true,
           "requires": {
             "balanced-match": "^1.0.0",
             "concat-map": "0.0.1"
@@ -3770,18 +3767,15 @@
         },
         "code-point-at": {
           "version": "1.1.0",
-          "bundled": true,
-          "optional": true
+          "bundled": true
         },
         "concat-map": {
           "version": "0.0.1",
-          "bundled": true,
-          "optional": true
+          "bundled": true
         },
         "console-control-strings": {
           "version": "1.1.0",
-          "bundled": true,
-          "optional": true
+          "bundled": true
         },
         "core-util-is": {
           "version": "1.0.2",
@@ -3884,8 +3878,7 @@
         },
         "inherits": {
           "version": "2.0.3",
-          "bundled": true,
-          "optional": true
+          "bundled": true
         },
         "ini": {
           "version": "1.3.5",
@@ -3895,7 +3888,6 @@
         "is-fullwidth-code-point": {
           "version": "1.0.0",
           "bundled": true,
-          "optional": true,
           "requires": {
             "number-is-nan": "^1.0.0"
           }
@@ -3908,20 +3900,17 @@
         "minimatch": {
           "version": "3.0.4",
           "bundled": true,
-          "optional": true,
           "requires": {
             "brace-expansion": "^1.1.7"
           }
         },
         "minimist": {
           "version": "0.0.8",
-          "bundled": true,
-          "optional": true
+          "bundled": true
         },
         "minipass": {
           "version": "2.2.4",
           "bundled": true,
-          "optional": true,
           "requires": {
             "safe-buffer": "^5.1.1",
             "yallist": "^3.0.0"
@@ -3938,7 +3927,6 @@
         "mkdirp": {
           "version": "0.5.1",
           "bundled": true,
-          "optional": true,
           "requires": {
             "minimist": "0.0.8"
           }
@@ -4011,8 +3999,7 @@
         },
         "number-is-nan": {
           "version": "1.0.1",
-          "bundled": true,
-          "optional": true
+          "bundled": true
         },
         "object-assign": {
           "version": "4.1.1",
@@ -4022,7 +4009,6 @@
         "once": {
           "version": "1.4.0",
           "bundled": true,
-          "optional": true,
           "requires": {
             "wrappy": "1"
           }
@@ -4098,8 +4084,7 @@
         },
         "safe-buffer": {
           "version": "5.1.1",
-          "bundled": true,
-          "optional": true
+          "bundled": true
         },
         "safer-buffer": {
           "version": "2.1.2",
@@ -4129,7 +4114,6 @@
         "string-width": {
           "version": "1.0.2",
           "bundled": true,
-          "optional": true,
           "requires": {
             "code-point-at": "^1.0.0",
             "is-fullwidth-code-point": "^1.0.0",
@@ -4147,7 +4131,6 @@
         "strip-ansi": {
           "version": "3.0.1",
           "bundled": true,
-          "optional": true,
           "requires": {
             "ansi-regex": "^2.0.0"
           }
@@ -4186,13 +4169,11 @@
         },
         "wrappy": {
           "version": "1.0.2",
-          "bundled": true,
-          "optional": true
+          "bundled": true
         },
         "yallist": {
           "version": "3.0.2",
-          "bundled": true,
-          "optional": true
+          "bundled": true
         }
       }
     },
@@ -6033,6 +6014,11 @@
         }
       }
     },
+    "obv": {
+      "version": "0.0.1",
+      "resolved": "https://registry.npmjs.org/obv/-/obv-0.0.1.tgz",
+      "integrity": "sha1-yyNhBjQVNvDaxIFeBnCCIcrX+14="
+    },
     "on-finished": {
       "version": "2.3.0",
       "resolved": "https://registry.npmjs.org/on-finished/-/on-finished-2.3.0.tgz",
diff --git a/package.json b/package.json
index d1c38e5..d35c6b1 100644
--- a/package.json
+++ b/package.json
@@ -24,6 +24,7 @@
     "js-joda": "^1.8.2",
     "moment": "^2.22.1",
     "object-path": "^0.11.4",
+    "obv": "0.0.1",
     "react": "16.4.1",
     "react-native": "^0.56.0",
     "react-native-calendars": "^1.19.3",