Long-term users have reported calibration drift over decades, often fixed by adjusting internal trimmers.
Metex M-4650CR is a classic -digit handheld digital multimeter (DMM) known for its high precision (20,000 counts) and integrated RS232 serial connectivity. Although it is considered a legacy device, it remains a staple in many electronics labs and workshops due to its reliability and high resolution, which is equivalent to roughly 14 bits of accuracy. Metex M-4650CR Key Specifications 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 it often indicates internal contamination