Current advances in reader technology offer users of two-dimensional bar co
des many choices in selecting a hand-held reader for their particular appli
cation. Specifications exist that describe required functionality for vario
us scanning technologies, but little work has been done in the published li
terature with respect to assessing the relative performances of these techn
ologies when actually incorporated into a hand-held unit. In this paper, a
suite of standard tests is presented to measure the decode time of hand-hel
d readers. These tests were applied to a PDF417 two-dimensional bar code sy
mbol and used to compare the performance of five newly developed hand-held
readers over four different reader technologies. The technologies included
laser scanning, linear CCD, area CCD, and CMOS technology. The tests focuse
d on the following factors that typically affect decode time: lighting cond
itions, reading distance, orientation angles of the reader, and use of the
readers in a typical freehand application. Results show the tests to be a v
alid means for comparing performance of differing hand-held reader technolo
gies typically used for two-dimensional symbologies.