KYORITSU KEW8140 Series Leakage Clamp Sensor User manual

Hello, I'm a chat assistant that has read the instruction manual for the KYORITSU KEW 8146, KEW 8147, and KEW 8148 Leakage Clamp Sensors. This manual details the safety precautions, operating instructions, and specifications for these devices, which are designed for measuring AC leakage current. I am ready to answer any questions you might have about these sensors and their use.
What is the maximum voltage that can be measured?

What should I do if the transformer jaws do not fully close?

What are the measurement categories?

How should I clean the instrument?