Well out of the 3 I had, every one developed faults. Kept coming up with FFF on the display - had to reset the 1.96m calibration all the time - kept losing its memory, illumination kept going wrong.

The last one I had, I sold it but before I did, sent it back to Spa to have it repaired again. Had it sent direct to the guy who bought it off me (a mate) and surprise surprise it went wrong again - so I gave him his money back and threw it in the bin!!

Not a good experience of this product!!!