CCTV tester PK-CCTV-TESTER-200 is a good cctv test tool.
It has below functions and features:
Video test function;
PTZ control and test function;
updated RS485 data test function;
Output DC12V power to camera;
multi-meter function;
Video signal attenuation analyzing;
powered by power adaptor or rechargeable battery;
video generating function;
support more than 20 kinds of RS485 protocol;
960*240mm