Equipped with rechargeable battery and simultaneous charging functionality, this diagnostic tool friendly operations with redness / green charging indicators for uninterrupted troubleshooting for repair technicians and IT professional maintaining desktop computers, servers, or troubleshooting common memory issue like dirty contacts, PCBs fractures, and damaged data line resistors Featuring two power supply mode ( battery or Type C fast charging) and manual operations, its metal construction ensures durability while LED brightness variation pinpoints faulty data lines during memory diagnostics Quickly identify memory module faults including oxidized gold fingers, brokens traces, and defective memory chip through visual LED feedbacks, streamlining hardware troubleshooting for both home workshops and professional repair centers This 4 in 1 DDR3 / DDR4 / DDR5UDMM / DDR5RDIMM memory tester diagnoses hardware faults through LED indicators, supporting comprehensive testing for desktop and servers rams module with open / short circuit detection