Open hardware Milliohmmeter, microohmmeter, microvoltmeter, and accurate ESR meter based on STM32F373 processor and AD8253 instrumentation amplifier (DIY do it yourself hobby construction)
Looking for service manual/schematics for the Microohm meter Schuetz MR 300 C
Design & Build a Milliohm Meter – Scullcom
Paul's DIY electronics blog: Building a Milli-Ohm Meter
Battery-Powered Circuit Measures Milli Ohms and Micro Ohms