2x Fluoride Filters (4 months each = 8-month supply)

Slide out the old filter and discard it

Calibration: User calibration function

durable housing

HM Digital ZT-2 Basic TDS Tester ORP controller 2x Fluoride Filters (4 monthsThe ZT 2 is the first of HM Digital's new HMD line. It's a low cost TDS meter that's perfect as a promotional item. Though inexpensive, this meter does not skimp on quality, features and design. Features Economy model that is ideal for end users and retail products. Highly efficient and accurate due to its advanced microprocessor technology. Auto off function: the meter shuts off automatically after 10 minutes of non use to conserve batteries.