HP clcltrs r vrs clcltrs mnfctrd by th Hwltt-Pckrd cmpny vr th yrs. Thr dsktp mdls ncldd th HP 9800 srs, whl thr hndhld mdls strtd wth th HP-35. Thr fcs hs bn n hgh-nd scntfc, ngnrng nd cmplx fnncl ss.