Something important to note, if this device is to be used for tuning and fault finding, setting the timing at say 1000RPM might be fine, but when the engines RPM increases there may be a fault which causes improper advance of the timing, or perhaps no advance at all, I'd say its important to be able to check the timing at RPM at least up to 6000RPM and even higher, some performance engines will easily go above 10,000RPM... just some things to consider anyway...