The Benning MM 10-1 is a handheld multimeter and digital data logger with a CAT IV 600 V rating and a display capacity of 6000 counts. It is a versatile voltage meter and ammeter ideal for testing and measuring voltage, current, and frequency in a variety of electrical applications. Manufactured by Benning, this multi-purpose tester is typically used by electricians and technicians for detailed diagnostics and safety assessments.