Model No. TDS-999 (same as TDS-1)

Portable and light-weight wide-range pocket TDS tester with on/off switch. Completely dry design without the need to dip the probes in water while not in use.

Range: 0-1999ppm ("ERR" displays if TDS is above limit)

Accuracy: + / - 2%

Battery:3V lithium battery CR2032

Battery life: approx 150 hours; auto-shutoff after 1 minute of non-use

Soft case included

This is an economical TDS tester suitable for general (non-professional) usage.

From our Frequently-Asked Questions (FAQ) section:

Q.
How can I extend the life of the Reverse Osmosis membrane (the most expensive replaceable cartridge in an RO system)?

A.
A reverse osmosis membrane's normal life is 3 years or more. To extend its life, you should ensure that the sediment cartridge is not clogged up with sediments. Examine the sediment pre-filter every 6 months and change it if there's any sign of clogging resulting in slower water flow through the RO unit. Stronger flow of water through the RO unit can increase the % of impurities rejection by the membrane, and also increase the effectiveness of the current flushing impurities down the drain. To more accurately determine the % rejection rate of impurities of a membrane, you need to use a TDS (total dissolved solids) meter to compare the TDS content of filtered water versus unfiltered feed water. A pen-type TDS meter is the simplest and inexpensive gadget for this purpose. Please note that when measuring the real TDS value of the product water from an RO membrane, you should first ensure that the pre-filters are not clogged up, as clogged pre-filters will reduce the water pressure and lower the TDS-rejection efficiency of RO membranes, thereby giving false results when measurements are taken by a TDS meter.