Basic electrical testers are essential tools for diagnosing and troubleshooting electrical systems in industrial settings. These devices include multimeters, voltage testers, continuity testers, and insulation resistance testers, designed to measure voltage, current, resistance, and other electrical parameters. They feature rugged construction for durability in harsh environments, with safety certifications like CAT ratings for protection against electrical hazards. Common applications include maintenance, quality control, and compliance testing in manufacturing, utilities, and automation. Key features may include digital displays, auto-ranging, data logging, and wireless connectivity for efficient industrial use.