EDIT: As an additional measure, I would also recommend that the property owner or manager ensures that the tenant is instructed on how to properly secure the pool when not in use, and have them sign some sort of documentation stating that this instruction was provided, and that they understand the pool must be secured at all times when not in use.

Besides flashlight, measuring tape, telescoping ladder,outlet tester, and electronic thermometer\ moisture detector what else should I pack.

It's very important and often not given the credit it's due until you are in a situation like you describe.It's cause you can't measure risk really in real estate.

Lenders will look at that in relationship to your overall debt to measure your borrowing capacity, and realistically, you won’t be in a good position.

One way to measure the future is take a look at syndicator portfolio holding and check the financing type of each property, if they choose the majority of the portfolio into floating rate and the baloon payment is this year or next year, they are definetely going to experience "crash" time.Most syndicator is just buying times these days, hoping the rate would be normalized in after 2025.Invest in equity investment could be silly except if they could come up with 50% cash.In high rate environment, you may want to invest in debt investment and you act as the bank.In low rate environment, you may want to invest in equity investment with leverage.

I certain have taken measurements and done other evaluations on a property before making an offer or getting under contract during the time I was a General Building Contractor. 

I might suggest separate bookkeeping to measure profitability.

I'll keep a flashlight, measuring tape, and occasionally an outlet tester on me to check for grounding, reversed polarity, and the tape for measuring room sizes to ensure conformity to bedroom standards (height, fsqft). 

Of course, if you are sizably leveraged, then your roi will be much higher --- but, I don't know which statistic you use to measure your investing... 

Just measure the spaces (ie bathroom floor and tub wall need to be tiled).