Cannister tests now read 0. They charge $35 to test, and instead of correcting the reading, they provide you with a percent conversion factor so you can convert the displayed reading to an actual reading. This is unacceptable.

When you plug it in, there's no instant reading - it takes a day or two. There is a way to turn off the alarm beep, but i've found it will mysteriously turn itself back on after a while. Final nail in the coffin is it it incessantly beeps every time i...  Read More

Going to the electronic recycling scrap heap. Only got half my money back on returning unit. I seldom write reviews, this product is so disappointing that i am compelled to!

Manual says something lame imprecise language about electrical / field interference -- bs. After 2 days it always has an error code that there is electrical interference.