diff --git a/Gosund-SP1.md b/Gosund-SP1.md
index b4802265..13ba05e3 100644
--- a/Gosund-SP1.md
+++ b/Gosund-SP1.md
@@ -1,6 +1,6 @@
-https://www.amazon.de/gp/product/B0777BWS1P
+[Purchase](https://www.amazon.de/gp/product/B0777BWS1P)
 
-There are three clones -- use the device type Teckin:
+There are several clones of this device -- use the Teckin device:
 
 *    Gosund SP1 (Version 2.3)
      * To configure select Gosund SP1 v23 (55) or console command `Module 55`
@@ -8,18 +8,11 @@ There are three clones -- use the device type Teckin:
      * To configure select Gosund SP1 v23 (55) or console command `Module 55`
 *    BlitzWolf SHP2 (Version 2.3)
 
-For more pictures see: https://www.bastelbunker.de/gosund-sp1-mit-tasmota/
-
 # Calibration 
 
-if you have another (better) volt and power meter: in the web-interface -- console:
-Enter the (correct) reading with the following commands should increase the precision
- 
-* VoltageSet [Volt]
-* PowerSet [Watt]
-* CurrentSet [Current]
+If you have another (better) volt and power meter, this procedure should increase the precision. Use an incandescent bulb or an iron. In the web UI Console, enter the (correct) readings using the following commands:
 
-You can use any consumer eg. a lamp or a pressing iron.
+`Backlog VoltageSet <voltage>; CurrentSet <current>; PowerSet <wattage>`
 
 # Details
 
@@ -29,3 +22,4 @@ You can use any consumer eg. a lamp or a pressing iron.
 
 ![GPIO 0 - copy from issues/4303](https://user-images.githubusercontent.com/644662/48127125-3c983000-e283-11e8-8008-aa1c18974413.png)
 
+[More pictures](https://www.bastelbunker.de/gosund-sp1-mit-tasmota/)