thermometer

[solo]

Hi everyone had this thermometer never used it. Was wondering what you all think of planning on using it when i setup tank, bin awhile so I'm planning on tangs going with 180 gallon tank 6 feet long 72x24x24. And someone told me 7 feet tank would be better. Doe a 180 gallon tank come 7 feet long or a 200 gallon tank.
Here is a picture of the thermometer.

 

[Beengirl]

Hi everyone had this thermometer never used it. Was wondering what you all think of planning on using it when i setup tank, bin awhile so I'm planning on tangs going with 180 gallon tank 6 feet long 72x24x24. And someone told me 7 feet tank would be better. Doe a 180 gallon tank come 7 feet long or a 200 gallon tank.
Here is a picture of the thermometer.

Here's some tank dimensions of various sizes:

100 Gallon 72 1/2 x 18 1/2 x 19 3/8
125 Gallon 72 1/2 x 18 1/2 x 23 3/8
150 Gallon 72 1/2 x 18 1/2 x 28 1/2
180 Gallon 72 1/2 x 24 1/2 x 25 5/8

Couldn't find the 200g dimensions. Sorry.
The thermometer looks fine to me. I have something similar. There's a piece that goes in the tank and that goes outside, right? I like the digital ones, are more accurate IMO.