Depends what brand of Pyro, and receiver device you have.
I had a H&S pyro and board and was getting high 1100's at WOT. Swapped it out for a Edge pyro to connect to my Edge Insight CTS and now they are mid 1200's.
I have a feeling the Edge is more accurate but that's personal opinion not scientific. Somebody I trust whispered that to me as well that they (H&S pyro's), were known to read a little erratic and low.