The cost of this layout is way more than $90. It requires the purchase of two multimeters as well, add about another $100, Next the person had better know how to set up the circuit running all those wires in & out of the meters.
This is an OK setup for someone who is experienced in basic electronics, but this is not for a novice who will end up spending many frustrating hours trying to get everything right so this can work & in the end will probably just give up.