AC Milliammeter, Model J0414, is suitable for the laboratories of middle schools and polytechnic schools to measure current intensity in the AC circuit.

J0414型交流毫安表适用于中学、中专等实验室测量交流电路中的电流强度。

Model JO415 DC microammeter is suitable for students to measure weak current and slimelectric potenial in laboratory of middle school and polytechnic school.

JO415型直流安培计适用于中学、中专等学校实验室，可测微弱电势用。