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This is the most interesting part. The Metex M 4650CR does not have a model variant called “12.” Instead, there are three likely interpretations:
Vital for DIYers looking to build their own RS-232 to USB adapters. metex m 4650cr pdf 12 hot
for all DC voltage ranges. If your meter shows unstable readings or is "running hot" (drifting) at this stage, it often indicates internal contamination, leaked battery juice, or a dirty range switch. METEX-4650CR.pdf - Mikrocontroller.net This is the most interesting part