The Mermin test is a type of Bell Test which can be applied to 3 entangled qubits. The test is evaluated using a Mermin inequality, the violation of which is only possible when the 3 qubits are in an entangled state on which we perform quantum measurements. Its violation therefore certifies true quantum nature from the observed statistics only. The advantage of using the Mermin inequality for randomness amplification is that, in the noiseless limit, a quantum device can reach the algebraic maximum, allowing the amplification of very weak sources of randomness.