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In-Line TDS

HM Digital TDS Meters for Home RO
HM Digital TDS Monitors are available in single and double monitor configurations:


HM Digital Dual TDS Monitors measure the tap water coming in vs. the purified water going out of your water filtration system at any time.

Single TDS Monitors, ideal for any water filtration system including reverse osmosis systems, coolers and more, display TDS level of a single water line.

HM Digital Home RO TDS Monitor Ordering Information

Model No. Description Measures Range Sensors Accuracy
DM-1 In-Line Dual TDS Monitor TDS Dual Range:
0-999 ppm or
1,000-9,990 ppm		 Dual
(in & out)		 ± 2%
DM-2 Commercial In-Line Dual TDS Monitor With Additional Features
(See Features Tab)		 TDS Dual Range:
0-999 ppm or
1,000-9,990 ppm		 Dual
(in & out)		 ± 2%
SM-1 In-Line Single TDS Monitor TDS Dual Range:
0-999 ppm or
1,000-9,990 ppm		 Single (1) ± 2%
QC-1 Quick Check “Push to Check” Monitor with Green “Good” and Red “Service” Lights.  Eight programmable set points. TDS & Conductivity 0-5,000 ppm
0-10,000 µS		 Single (1) ± 3%
DM-1 Dual Inline TDS Monitor

DM-1 Dual Inline TDS Monitor

 DM-2 Dual Inline TDS Monitor

DM-2 Dual Inline TDS Monitor

 SM-1 Single Inline TDS Monitor

SM-1 Single Inline TDS Monitor
QC-1 Single Inline TDS Monitor

QC-1 Single Inline TDS Monitor

 QC-1 Single Inline TDS Monitor in Use

QC-1 Single Inline TDS Monitor in Use

Note:  Tee fitting (sold separately) with a 1/4″ connection is required for installation.  Refer to Applied Membranes part # F-4UT44QC (1/4″ Tube) or F-6UT64QC (3/8″ Tube).