Based on this product's specifications, here are some alternatives and similar models
Insulation Resistance Meter Unit UT511 handheld tester with insulation measurement function
Summary description:
Handheld insulation resistance meter Unit UT511 designed for measuring insulation resistance of electrical installations and equipment. Provides portable testing capabilities for checking insulation integrity, detecting degradation or faults, and verifying safety compliance. Suitable for electricians and maintenance technicians for on-site diagnostics and preventive inspections.