The base unit has been sold. The prior posting had one error. It incorrectly stated that the high stability time base version had handwriting on the top of the case. This was incorrect. The base version had these markings. Howard W. Ashcraft FACCL, Hon. AIACC, LEED AP Hanson Bridgett LLP 415.995.5073 direct hashcraft at hansonbridgett.com