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I have this type of SPD, how can i test if this device still in good condition?

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  • \$\begingroup\$ Why wouldn’t they? \$\endgroup\$ – winny Nov 2 '19 at 23:33
  • \$\begingroup\$ what is the purpose of the window on the device? \$\endgroup\$ – jsotola Nov 3 '19 at 3:22

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