HM Digital DM-2 Commercial Dual TDS Monitor aquarium pH meter our meters are calibrated with

our meters are calibrated with a 342 ppm NaCl solution

Total volume: 1

Factory Calibrated — Calibrated with 342 ppm NaCl solution

The unit shuts off automatically after 10 minutes of non-use

Waterproof Design: Durable construction withstands splashes and wet environments

HM Digital DM-2 Commercial Dual TDS Monitor aquarium pH meter our meters are calibrated withInstall on industrial systems such as car washes, window washing, manufacturing, and food processing. UPGRADED APRIL 2012! The newly upgraded model features digital calibration, low battery indicator, improved accuracy, longer battery life (2 years), longer auto shut off time (3 min), diagnostic error messaging, and shielded sensor cables. (Upgraded features below are in red.) FEATURES Highly efficient and accurate due to its advanced microprocessor