I have an old one, model P4400.01, that has worked fine for many years. It is pretty accurate and I'm not aware of anything similar that is better. I don't use it on space heaters or large electric motors though, since the 15A maximum rating is a "blows up at" spec, not a safe level for continuous operation. I don't know if newer versions are worse. If you have blown F2--the 15A fuse set way off the board--you have simply overloaded it. Keep in mind that many large appliances may have surge loads much greater than 15A, although anything designed for continuous usage, like a space heater, should be limited to 12A continuous draw.