  At RHIC, the hydrogen jet target polarimeter (HJET) is used to measure proton
beam polarization with accuracy $\sigma_P^\text{syst}/P\lesssim0.5\%$ by
counting low energy (1--10 MeV) recoil protons in left-right symmetric
detectors. The HJET performance also allowed us to precisely measure $pp$ and
$p$A (where A is any ion stored at RHIC) analyzing powers in the CNI region.
The results of the measurements are discussed.
