These do not determine any measured values, but only exchange data packets between the end points of the routes and count whether and how many bits or packets have been lost on the route in order to deduce whether a data route is used to transmit a certain protocol (usually 1 Gigabit Ethernet ) suitable is.
One level below you will find the so-called verifiers, basically just simple wiring testers that check the correct assignment of the lines, without any information on the suitability or transmission properties.
Cabling certifiers, on the other hand, carry "correct" Measurements of many individual parameters, including simple DC properties such as loop resistance, as well as demanding high-frequency variables such as the insertion loss of a transmission channel or crosstalk between the channels.
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