The Kyoritsu KEW3122B is an analogue insulation resistance meter used to measure insulation resistance from 5/200GO with a test voltage up to 5kV. It has an advanced design with a large 5/200GO insulation resistance range, enabling accurate and reliable insulation resistance measurements in extreme environments. The KEW3122B features a wide range of safety functions for protection during use, including automatic discharge, neutral line indicator, polarity indication, open circuit voltage control, and temperature indicator. Additionally, the KEW3122B also has a low voltage indicator, warning light, and a current limiter to provide reliable testing results.