I owned a Fluke voltage tester and loved the quality & reliability.  Now when I needed a tone and probe product I knew I had to get the PRO3000.  I have a Sperry (aka Gardner Bender) ET64220 that had no power to trace wires through drywall.  It was good for small telephone wiring kinda stuff.  Well why waste your time with the Sperry when the Fluke does it all.  Believe me it does everything.  I have no problem using the probe through 5/8" thick drywall to locate NM wires.  The tone (either continuous or pulsating) is LOUD.  Takes the guess work out.  I've also used it's continuity function and that worked great too.  The quality and reliability of this product has made me become a lifelong Fluke customer from now on.  Don't waste your money experimenting with other products stick with Fluke and you'll be happy.  Highly recommended!