HM Digital AP-1 AquaPro Water Quality Tester for $18.99 Shipped

HM Digital AP-1 AquaPro Water Quality Tester for $13.99. Shipping is $5.00 for a total of $18.99 shipped.  Here is a screenshot for your reference. It measures total dissolved solids (TDS) and temperature,and features automatic temperature compensation, auto-off function, data-hold function and low-battery indicator.  Most places have it for about $25 or more.