Which PH tester should I get of these two?

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.

I have no idea what the difference is, but I can tell you that I have the first one. Very nice unit. Be sure to get the proper cleaning and calibration fluids as soon as you can.