I would suggest the orange PRO POINTER AT.
For $17 more it is water proof to 10 feet, high visibility
and
Shrink detection field to precisely pinpoint large targets
Tune out mineralized ground, wet beach sand, etc.
Help gauge target size/distance
Help identify edges of large target
Pinpoint multiple targets versus one large target signal
Lost Pro-Pointer Alarm: After 5 minutes with no button presses, the pinpointer emits periodic warning chirps.
Automatic power off after 60 minutes of warning chirps; saves batteries.
Simple, single-button operation for Power, Retune, Sensitivity adjustment, and Stealth Mode.
Ruler in Inches and Centimeters molded into side of pinpointer to judge target depth.
Lanyard Attachment Loop molded into side of pinpointer.
New power button is easy to operate even with gloves.