use a 7" tablet style device in a shielded (my AA170 wasn't) and outdoor-ruggedized case with rubber corners and anti-glare screen, kickstand, built in 5GHz wifi hotspot with web server for app-free wireless control, a couple dozen extra user configs/custom cals, port extensions, option to normalize chart to an arbitrary impedance, faster guts for better TDR measurements on smaller circuit board traces, and a complementary set of moderate quality Amphenol port savers just for being a loyal customer. And they can keep the li-ion battery and cheap charge port too, just leave room for three Energizer Lithiums.