I bought this thermometer with high expectations after reading the Amazon reviews. It replaced an old Oregon Scientific probe-type remote thermometer for which replacement sensors are is no longer available. Unfortunately, one of the two floating transmitters was defective - it had very poor range (less than 25' when floating in the pool), not even enough to reach the length of the pool let alone be received indoors. The other transmitter worked great - so well that I could put it in the skimmer basket and still receive the signal indoors, about 45' away.
I returned the kit and will buy another as a replacement - hopefully the second set will have two good transmitters.