Double Points May - Purchase this item and get 
Accurate *For fresh & saltwater * Designed for inside your aquarium *The LCD screen is very easy to read and is compact *It’s very reliable & runs on batteries which are included
* Completely submersible, compact design ensures discrete placement in your aquarium.
* Battery operated. Completely wireless device means no messy cables or probes. Also ensurers safer use – no need to unplug when maintaining your aquarium
* Clear and easy display shows continual readings with + or – 1C accuracy.
* Heavy duty plastic exterior reduces the risk of breakage
* High Quality long lasting suction cup
