[mike31154]

@ Raied. Yeah well, it was me that forgot to add the word 'stone' to lime, so my mistake. Assumptions can lead to confusion. As far as acid vs alkaline affecting TDS meter readings, again I'm just guessing, but you mention both are ionic solutions. My take is, pure DI water conducts no electricity since there are no impurities, whether acidic or alkaline. My high school physics goes back a long way, but ionic means there are free electrons? This means there is potential for current flow, i.e. conductivity. So it shouldn't matter whether a solution is acidic or alkaline, either one should conduct providing a reading on a conductivity (TDS) meter? Perhaps you could run this question by one of the highly intelligent (and paid) professors at your university!

EDIT: Google is your friend, I think I answered my own question, no need to bother the professor..

Properties of Acids
taste sour (don't taste them!)... the word 'acid' comes from the Latin acere, which means 'sour'
acids change litmus (a blue vegetable dye) from blue to red
their aqueous (water) solutions conduct electric current (are electrolytes)
react with bases to form salts and water
evolve hydrogen gas (H2) upon reaction with an active metal (such as alkali metals, alkaline earth metals, zinc, aluminum)

Properties of Bases
taste bitter (don't taste them!)
feel slippery or soapy (don't arbitrarily touch them!)
bases don't change the color of litmus; they can turn red (acidified) litmus back to blue
their aqueous (water) solutions conduct and electric current (are electrolytes)
react with acids to form salts and water