Chihiros Digital TDS Pen Temperature Tester Pen

An easy-to-use digital TDS/TEMP tester. 

A TDS Meter indicates the Total Dissolved Solids (TDS) of a solution, i.e. the concentration of dissolved solids in it. Since dissolved ionized solids such as salts and minerals increase the conductivity of a solution, a TDS meter measures the conductivity of the solution and estimates the TDS from that.

Dissolved organic solids such as sugar and microscopic solid particles such as colloids, do not significantly affect the conductivity of a solution, so a TDS meter does not include them in its reading.

Battery: 2 x 1.5V cell (not included!)