@Alexandra Reeves, in my experience, tape measure or laser measure is about the only reliable measuring device.  

Many connected devices have issues if the router changes the IP address rather than renewing the same IP each an every time.

Does anyone have a recommendation for a noise monitoring device?  

I have found that shock collars do not work, but these inexpensive anti-barking devices work pretty well.

Guests have been good about obeying the smoking outside rule.The other feature I like a lot is it will track how many smart devices are in the building based on the number of sync signals it detects.

If it is is a group home, chances are you are going to need a commercial sprinkler system and fire control devices(pull alarms) and panel installed.

. :)A limitation system can use email addresses and there are possibilites to check if applications with different email addresses come from the same computer/device.

I have tried using some, from time to time, and there are times that they device won't even work because there is not enough energy in the Harbor Freight battery. 

It literally takes 5-10 minutes to find a replacement, or you could call a local vendor, ask them to find the device for you, and pay what they charge, which is marked up to cover their research time.Keep in mind you can only charge depreciated value.

For example,Late RentInsufficient FundsUtility ReconnectionReissue CheckA/C Clean ViolationPest ControlRenewalMove-Out AdministrationUnlock RequestKey RequestFailure to Return KeyPilot LightingGrilling ViolationGarbage ViolationClogged Drain / Tub / ToiletWindow ScreenHurricane Shutter ViolationSmoking ViolationLease Amendment AmendmentPet ApplicationUnauthorized PetGuest ViolationUnauthorized OccupantInspection (due to tenant violation)Yard RemediationPool RemediationSmart Home Device TamperExterior Maintenance ViolationParking ViolationCommunity Amenity ViolationMarketing (tenant early termination)Notice (due to tenant violation) PreparationNotice DeliveryLien ViolationSubleaseAssociation ViolationEviction (not including attorney’s fees and eviction costs)Rent Verification10.