[Harp-L] Peterson 490 ST Strobe Tuner

I recently purchased a Peterson strobe tuner and it's giving me fits. I will warm my harp up and then go through it one note at a time writing down the cents plus and minus. I then go through a second time and find many notes are different. I check the next day and some are the same and some different. Has anyone had this problem? It's not my embouchure. I am very careful about that. I blow and draw with consistent volume to no avail. I was using Dirks tuner and having success. I wanted something more precise but this is driving me nuts. 

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