How to Use the MRCARTOOL H90 Spark Plug Tester
Set up the H90 on a safe 12 V bench supply, fit one or two spark plugs, sweep its 500–9000 rpm simulation and interpret a controlled side-by-side test.
Neo
How to Use the MRCARTOOL 24V-to-12V OBD Power Adapter
Verify the 24 V vehicle input, 12 V diagnostic-tool requirement and adapter load rating, then connect vehicle, converter and tool in order and stop for heat, flicker or an unstable power indicator.
How to Use the MRCARTOOL B80 OBD2 Memory Saver
Verify a 12 V backup battery, connect the B80 through the vehicle OBD port, preserve low-current module memory during battery replacement and disconnect without exposing a live battery cable.
How to Use the MRCARTOOL B550 Automotive Circuit Tester
Connect the B550 safely, use multimeter, oscilloscope and frequency modes, simulate a controlled 0–5 V sensor signal and activate only identified loads with the correct current limit.
How to Use the MRCARTOOL B530 Automotive Circuit Tester
Connect and self-test the B530, select DC, AC, resistance or tone mode, read polarity and continuity, respond to the circuit breaker and keep power injection away from unknown or protected vehicle circuits.
How to Install and Use the MRCARTOOL M95 GPS Inclinometer
Install the round M95 GPS slope meter safely, establish a level angle reference, acquire stable satellite data and interpret speed, direction, altitude, position, trip, voltage, pitch and roll without treating alarms as terrain limits.
How to Install and Use the MRCARTOOL M85 GPS Inclinometer
Install the M85 safely, acquire a stable satellite fix, set a trustworthy level reference, navigate its four displays and interpret speed, trip, position, voltage and slope data correctly.
How to Install and Use the MRCARTOOL M80 GPS/OBD Display
Mount the M80 level and safely route its OBD cable, distinguish ECU fields from satellite fields, verify compatibility and reception, and interpret speed, coolant, RPM, angle, altitude and voltage without overstating the display.
How to Install and Use the MRCARTOOL M60 GPS Inclinometer
Mount the M60 level and square, power it safely, acquire a stable GPS fix, configure units, overspeed and compensation while parked, and interpret pitch, roll, altitude, direction and voltage within their limits.
How to Install and Use the MRCARTOOL M50 Inclinometer
Align and level the MRCARTOOL M50, choose city or off-road mode, reset pitch and roll on a known level surface, set brightness and interpret voltage and angle warnings without treating the display range as a safe-driving limit.