I realize there have been complaints on pro-pointers, many of them legit, some not legit. But mine first one is on its 2nd year, thousands of holes and on/off cycles, many batteries, a few drops, never been washed, used to dig a bit in light soil, never been altered in any way. It still works fantastic and I wouldn't go out with out it!
I use a rechargeable 9v in it, and run it till it starts acting funny, but it runs a long time. Make sure the battery is tight in it and it runs great. Sometimes it will beep if set down usually due to some other metal object near it like my digger or buried junk.