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When working with computer circuitry, and in particular automotive ECUs, extreme care must be taken to ensure no damage is caused to any electrical components as excessive amounts of current or incorrect earthing can cause irreversible damage. The Toledo Computer Safe LED Circuit Tester is different from conventional circuit testers as it draws far smaller potentially damaging amps when testing a circuit. This tester also uses LED lights to indicate positive and negative polarity. The heavy duty acetate handle holds a stainless steel probe which connects to a 1 metre coil type rubber lead ground connection making it perfect for checking ECU circuitry as well as other applications around the vehicle.