LinkCheck.
https://www.amazon.com/Smartronix-Linkcheck-Ethernet-Tester/dp/B000RGI6R6/ref=cm_cr_arp_d_product_top?ie=UTF8
Like this? https://www.amazon.com/Smartronix-Linkcheck-Ethernet-Tester/dp/B000RGI6R6/ref=cm_cr_arp_d_product_top?ie=UTF8
But it is unavailable and only does 10/100