Although it is not the best way to test it, actually getting a tingle while you are in the pool is usually what prompts the call.
If I was going to "probe" the water I would clip my lead to a foot or so of aluminum foil and drop that in the pool, then measure to anything you can touch. I would still be skeptical of any reading I got with a digital meter without a couple hundred k shunt.
You may already have some bonding going on if you have a regular pump (not double insulated). If you have a heater there is plenty of bonding going on.
Probably the most effective bonding would be a bonded metal ladder in the water.
