diff --git a/docs/assets/img/product_pics/unit/unit_weight_01.png b/docs/assets/img/product_pics/unit/unit_weight_01.png
index abb34290..67f58ad2 100644
Binary files a/docs/assets/img/product_pics/unit/unit_weight_01.png and b/docs/assets/img/product_pics/unit/unit_weight_01.png differ
diff --git a/docs/en/unit/angle.md b/docs/en/unit/angle.md
index 25b6135d..a9815086 100644
--- a/docs/en/unit/angle.md
+++ b/docs/en/unit/angle.md
@@ -37,6 +37,8 @@ The Unit's Grove interface is black, indicating an analog interface that needs t
 
 *The below code is incomplete(just for usage). If you want the complete code, please click [here](https://github.com/m5stack/M5-ProductExampleCodes/tree/master/Unit/ANGLE/Arduino).*
 
+Example function: Display the digital quantity corresponding to the Unit output voltage value on the screen, the range is 0 ~ 4095
+
 ```arduino
 #include <M5Stack.h>
 // select the input pin for the potentiometer
diff --git a/docs/en/unit/env.md b/docs/en/unit/env.md
index 382f55d4..9e5019fe 100644
--- a/docs/en/unit/env.md
+++ b/docs/en/unit/env.md
@@ -16,10 +16,10 @@ temperature and humidity sensor and absolute barometric pressure sensor. Connect
 ## Feature
 
 -  Temperature:
-    -  measuring range: 20 ~ 60℃
+    -  measuring range: -20 ~ 60 ℃
     -  resolution: ±0.2℃
 -  Humidity:
-    -  measuring range: 20 ~ 95℃
+    -  measuring range: 20 ~ 95 %RH
     -  resolution: 0.1%
 -  Air pressure
     -  measuring range: 300 ~ 1100hPa
diff --git a/docs/ja/unit/env.md b/docs/ja/unit/env.md
index 8808d671..282f4ea4 100644
--- a/docs/ja/unit/env.md
+++ b/docs/ja/unit/env.md
@@ -13,10 +13,10 @@
 ## 特徴
 
 - 温度:
-  - 計測範囲: 20 ~ 60℃
+  - 計測範囲: -20 ~ 60 ℃
   - 精度: ±0.2℃
 - 湿度:
-  - 計測範囲: 20 ~ 95℃
+  - 計測範囲: 20 ~ 95 %RH
   - 精度: 0.1%
 - 気圧:
   - 計測範囲: 300 ~ 1100hPa
diff --git a/docs/zh_CN/unit/angle.md b/docs/zh_CN/unit/angle.md
index 5bd30633..2e236c3a 100644
--- a/docs/zh_CN/unit/angle.md
+++ b/docs/zh_CN/unit/angle.md
@@ -37,6 +37,8 @@
 
 *以下仅为用法示意，并不完整。如果需要完整例程请点击[这里](https://github.com/m5stack/M5-ProductExampleCodes/tree/master/Unit/ANGLE/Arduino)。*
 
+例程功能：在屏幕上显示 Unit 输出电压值对应的数字量，范围是 0 ~ 4095
+
 ```arduino
 #include <M5Stack.h>
 // select the input pin for the potentiometer
diff --git a/docs/zh_CN/unit/env.md b/docs/zh_CN/unit/env.md
index fd9b885e..e8fd0def 100644
--- a/docs/zh_CN/unit/env.md
+++ b/docs/zh_CN/unit/env.md
@@ -15,7 +15,7 @@
 ## 特性
 
 -  温度测量
-    - 范围: 20 ~ 60 ℃
+    - 范围: -20 ~ 60 ℃
     - 精度: ±0.2 ℃
 -  湿度测量
     - 范围: 20 ~ 95 %RH