25% OFF Apogee 210x, 510, 520

Hi, Sorry that is not more clear. If you buy a meter and a want, you get the case for free. So if you have both items in your cart you'll get the case automatically.
 
Sounds good. The 510 and 520 is the same sensor, so you'll get equal results. Just depends if you need the portability of the meter. If it's no problem haivng your laptop by the tank, you can save some money going with the 510.
 

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