You might rethink the idea of not turning off the breakers to test; it really is the most effective way. Commercial circuit testers can be very confusing to use, most transmit a signal on the circuit you are testing, but signals can cross to other circuits where the conductors come into close proximity of each other.
I think that you may find it wise to invest in new circuits for your kitchen, a minor rewiring job. Your fridge, microwave, and other appliances should have their own circuits, as most will draw large currents when compressors, transformers and motors start up. You could lose a fridge full of food, for instance, if a breaker trips and you don't notice it.
If you are testing individual receptacles, be aware that it is possible that the top and bottom receptacle on the same device may be electrically isolated from each other, and may be wired to two separate breakers. This is called a "split receptacle" and there are rules as to how they are physically wired, and how the breakers are installed and marked. The breakers usually must be side by side, with the toggles mechanically tied together. But, in an old DIY type install the rules may not have been followed closely.
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