What is the difference between these two PH meters?

I want to get one of these two but I don't know which one. They are both basically the same until the last part, there are some letters that are different. Anyone know what they stand for or which one is better suited for my use.



HI 98129 - Combo pH/EC/TDS/Temp Tester w/LR EC

HI 98130 - Combo pH/EC/TDS/Temp Tester w/HR EC

Thanks for your help.

low range high range i think but not positive

Which one should I get?