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LED number 13 is blinking and the ready light is off

- infrared filter clogged!

Open the inspection cover..   the infrared filter glasses might be dirty..   clean the glasses with a cotton
stick (10036) and alcohol (10035)..
 
         
Close the inspection cover.          

 

If this does not help, do as follows..

Replace measuring head housing and electronic module.
Use our ExP for this procedure

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