A portable, battery-powered insulation resistance tester (megohmmeter) and continuity tester, often used in electrical installation testing, motor winding checks, and cable fault finding.
If you have the manual, follow the pre-test lead verification and discharge procedure every time – that’s where most user errors happen. Bst Ekr 1000 Manual
The is a well-regarded piece of test equipment, but whether it’s a "good piece" depends heavily on your use case. Here’s a quick breakdown: often used in electrical installation testing