These water testers do a variety of tasks. Make sure you choose the right combo meter for your application. Our best selling TDS Meters are the sm802 and sm801. We also have lab grade units available as well for more precision water testing in many applications including instructions on how to measure Kangen orp water testing and aquariums. I
The Milwaukee Instruments Mw 500 with Se 300 with BNC What Probe along with the sm101 , sm100 or sm102 all are great additions.