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I recently started to use my phone to monitor the conditions of my plant collection with a couple of Sensorpush devices. They report temperature, humidity, barometric pressure, and vapor pressure once a minute via Bluetooth, and I get a notification if conditions deviate from what I set. It has been very helpful at dialing in things in and responding to problems.
Get some Revolution Pro or Advantage, follow the directions on the box. They are very effective unless you have a serious infestation, which it sounds like you don’t. Just make sure it’s the cat version and for the correct weight range of your cats.