Instruct: Classify Amazon reviews into positive or negative sentiment
Query: ZIRCON i700

I READ A REVIEW THAT SAID HE HAD PLASTERBOARD OVER PLASTER WALLS AND THIS STUD FINDER WORK GREAT.DON'T BELEAVE IT. I HAVE 3/8 SHEETROCK OVER PLASTER WALLS AND IT DON'T WORK FOR ME.WERE I HAVE 3/8 SHEETROCK ONLY IT SHOWS A WATER PIPE AS A STUD AND CAN'T FIND THE STUD.