I too will caution there are surge protectors and spike supressors which are often called, in my opinion improperly, surge protectors (Alas it is the standard practice though).
I have both.. Spike suppressors are good at clipping spikes, such as when a motor starts or stops. but in a true surge.. Not so hot (Turn into firecrackers in fact).
A true Surge protector, will have an indicator that is more than an "idiot light" it will be a alpha-numberic digital readout.. That is the easiest way to tell 'em apart.
mine gives me voltage and current on L-1 and L-2, (it is a 50 amp model) and the error code should it shut me down. Lots of info.