Designed for automated test or bench top use, the Guardian 1050 provides current to 45 Amps to meet the most stringent standards, and the economical Sentry 50 Plus provides current to 30 Amps for less demanding applications. Some of the features that make either unit ideal for verifying ground integrity of the product chassis and power line ground include four terminal Kelvin connection with auto zeroing, programmable hi/lo limits for pass/fail testing, and resistance measurements from 0.1 to 510 milliohms.