When I used to work at Keithley I saw quite a few null meters or old electrometers with analog needles on them still being used. Pretty sure the guys using them weren't still keeping the calibration up to date for the last 40 years =)
What are the engineering and design challenges in creating successful IoT devices? These devices are usually small, resource-constrained electronics designed to sense, collect, send, and/or interpret data. Some of the devices need to be smart enough to act upon data in real time, 24/7. Specifically the guests will discuss sensors, security, and lessons from IoT deployments.