Both BM550 and BM550 PLUS can test 6V 12V 24V batteries, and both support SOC and SOH test functions. BM550 with a black and white backlit screen, BM550 PLUS with a color screen. KINGBOLEN BM550 Car Battery Tester OBD2 6V 12V 24V 100-2000 CCA 2Ah-220Ah Battery System Detect Auto Battery Analyzer Car Diagnostic Tool.
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