An ebay find made its way into the lab- an industrial quality DMM from Hioki, made in 1984! The meter has some pretty good specs as shown in this datasheet:

• 3.5 digit (1999 count), 0.5% on DC voltage
• 20uA DC current range with 10nA resolution
• 1G input resistance on 200mV range
• Drop proof to 1 meter
• Dust sealed.
• 500 hours battery life using 2 AA
• Neon indicator of overvoltage Continue reading →