HM Digital - Great Lakes International, Inc.

HM Digital, Inc. is a manufacturer of handheld and portable TDS, EC, pH, and ORP testers, inline monitors, controllers, and accessories for reverse osmosis (RO) water filters, water purification systems, hydroponics, aquariums, pools, and many other applications.

• AP-1: AquaPro Water Quality Tester (TDS)

• AP-2: AquaPro Water Quality Tester (EC)

• COM-100: EC / TDS / Temperature Meter

• EC-3: Conductivity Tester & Carrying Case

• ORP-200: Waterproof ORP Meter

• pH-200: Waterproof pH Meter

• DM-1: In-Line Dual TDS Monitor

• DM-2: Commercial In-Line TDS Monitor

• DM-2EC: Commercial In-Line EC Monitor

• FM-2: Filter Monitor with Volumizer

• CIC-152: Dual Control TDS / EC Controller

• PS-100: Panel Mount TDS Controller

• PS-200: Dual TDS Controller

• PM-1: OEM In-Line-TDS Purity Monitor

• PM-2: External In-Line TDS Purity Monitor

• QC-1: TDS / Conductivity Monitor

• TDS-3: Handheld Meter & Carrying Case

• TDS-4: Pocket Size Handheld Meter

• TDS-4TM: Meter with Digital Thermometer

• TDS-EZ: Water Quality Tester

• ZT-2: Basic & Handheld TDS Tester

• TM-1: Industrial Digital Thermometer

• PS-202: Dual Display TDS Controller

• PSC-150: Ex-Range TDS / EC Controller

• PSC-154: TDS / EC Control 4-20mA Output

HM DIGITAL

HANDHELD TESTERS

IN-LINE MONITORS

CONTROLLERS

• FMS-1: Water Flow Switch

• FMS-2: Flow Sensor

• ORP Buffer Solution / Electrode Test Kit

• pH / ORP Electrode Storage Solution

• pH Buffer Solution Variety Pack

• TDS / EC Calibration Solutions

• TDS / EC Sensors

ACCESSORIES

SENSORS

• LeakBlock Sensor

• HM Digital Product Guide