In-Line Monitors
An in-line monitor is a type of water quality tester that measures the total dissolved solids (TDS), flow, and volume of your water.
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HM Digital DM-2 Commercial In-Line Dual TDS Meter
no fitting (1/4" probes only) - $33.86
1/4" Feed x 1/4" Product - $36.97
1/4" Feed x 3/8" Product - $38.00
1/4" Feed x 1/2" Product - $38.47
3/8" Feed x 1/4" Product - $38.00
3/8" Feed x 3/8" Product - $39.03
3/8" Feed x 1/2" Product - $39.50
1/2" Feed x 3/8" Product - $41.36
1/2" Feed x 1/2" Product - $39.96
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HM Digital DM-1 Dual TDS Meter
No Fittings - $34.91
1/4" Feed x 3/8" Product - $29.13
1/4" Feed x 1/4" Product - $28.10
3/8" Feed x 3/8" Product - $30.16
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StreamLabs® Wireless Control Monitor and Shut Off Valve
3/4" FNPT PRO - $628.57
1" FNPT PRO - $628.57
1-1/4" FNPT PRO - $678.57
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HM Digital LDM-100R Commercial Grade Dual Line EC/TDS Monitor
Default Title - $87.52
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HM Digital PSC-64D Mini Dual Display EC/TDS Monitor with 4-20mA Output
Default Title - $148.40
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HM Digital FLM-3 Flow Monitor
Default Title - $44.67
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HM Digital LSM-100 Commercial Inline EC/TDS Monitor
Default Title - $76.83
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HM Digital TRM-1 Triple Inline TDS Monitor
1/4" Fittings - $41.29
3/8" Fittings - $42.00
1/2" Fittings - $44.86
No Fittings - $35.75
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HM Digital SM-1 Inline Single TDS Monitor 1/4" Push-in
Default Title - $23.30
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HM Digital PSC-60D Dual Inline EC/TDS Monitor
Default Title - $119.40
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StreamLabs® Smart Home Water Monitor
Default Title - $198.57
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HM Digital FM-2 Filter Monitor With Flow Sensor and Volumizer
With Faucet Indicator - $59.17
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HM Digital QC-1 Quick Check TDS Monitor 1/4" Push-in
1/4" Quick Connect - $27.42
No Fitting - $18.80
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HM Digital DM-3 Commercial In-Line Dual TDS Meter
No Fittings - $66.95
1/4" Feed x 1/4" Product - $71.09
1/4" Feed x 3/8" Product - $72.31
1/4" Feed x 1/2" Product - $74.21
3/8" Feed x 1/4" Product - $72.31
3/8" Feed x 3/8" Product - $70.24
3/8" Feed x 1/2" Product - $75.43
1/2" Feed x 3/8" Product - $75.43
1/2" Feed x 1/2" Product - $72.14
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HM Digital PM-2 External Inline TDS Purity Monitor
1/4" push-in - $49.54
3/8" push-in - $50.57
1/2" push-in - $59.28
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HM Digital PM-2-NF External Inline TDS Purity Monitor with Transformer
Default Title - $47.98
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RO Percent Rejection Monitor
Default Title - $35.97
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LED Indicator Green/Yellow for CMS-1000R
Default Title - $8.47
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HM Digital FM-1 Filter Monitor With Water Flow Switch
Default Title - $26.69
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HM Digital FM-1 Filter Monitor - Meter Only
Default Title - $24.95
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HM Digital DM-2 Commercial In-Line Dual TDS Meter
no fitting (1/4" probes only) - $33.86
1/4" Feed x 1/4" Product - $36.97
1/4" Feed x 3/8" Product - $38.00
1/4" Feed x 1/2" Product - $38.47
3/8" Feed x 1/4" Product - $38.00
3/8" Feed x 3/8" Product - $39.03
3/8" Feed x 1/2" Product - $39.50
1/2" Feed x 3/8" Product - $41.36
1/2" Feed x 1/2" Product - $39.96
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HM Digital DM-1 Dual TDS Meter
No Fittings - $34.91
1/4" Feed x 3/8" Product - $29.13
1/4" Feed x 1/4" Product - $28.10
3/8" Feed x 3/8" Product - $30.16
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StreamLabs® Wireless Control Monitor and Shut Off Valve
3/4" FNPT PRO - $628.57
1" FNPT PRO - $628.57
1-1/4" FNPT PRO - $678.57
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HM Digital LDM-100R Commercial Grade Dual Line EC/TDS Monitor
Default Title - $87.52
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HM Digital PSC-64D Mini Dual Display EC/TDS Monitor with 4-20mA Output
Default Title - $148.40
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HM Digital FLM-3 Flow Monitor
Default Title - $44.67
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HM Digital LSM-100 Commercial Inline EC/TDS Monitor
Default Title - $76.83
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HM Digital TRM-1 Triple Inline TDS Monitor
1/4" Fittings - $41.29
3/8" Fittings - $42.00
1/2" Fittings - $44.86
No Fittings - $35.75
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HM Digital SM-1 Inline Single TDS Monitor 1/4" Push-in
Default Title - $23.30
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HM Digital PSC-60D Dual Inline EC/TDS Monitor
Default Title - $119.40
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StreamLabs® Smart Home Water Monitor
Default Title - $198.57
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HM Digital FM-2 Filter Monitor With Flow Sensor and Volumizer
With Faucet Indicator - $59.17
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HM Digital QC-1 Quick Check TDS Monitor 1/4" Push-in
1/4" Quick Connect - $27.42
No Fitting - $18.80
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HM Digital DM-3 Commercial In-Line Dual TDS Meter
No Fittings - $66.95
1/4" Feed x 1/4" Product - $71.09
1/4" Feed x 3/8" Product - $72.31
1/4" Feed x 1/2" Product - $74.21
3/8" Feed x 1/4" Product - $72.31
3/8" Feed x 3/8" Product - $70.24
3/8" Feed x 1/2" Product - $75.43
1/2" Feed x 3/8" Product - $75.43
1/2" Feed x 1/2" Product - $72.14
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HM Digital PM-2 External Inline TDS Purity Monitor
1/4" push-in - $49.54
3/8" push-in - $50.57
1/2" push-in - $59.28
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HM Digital PM-2-NF External Inline TDS Purity Monitor with Transformer
Default Title - $47.98
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RO Percent Rejection Monitor
Default Title - $35.97
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LED Indicator Green/Yellow for CMS-1000R
Default Title - $8.47
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HM Digital FM-1 Filter Monitor With Water Flow Switch
Default Title - $26.69
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HM Digital FM-1 Filter Monitor - Meter Only
Default Title - $24.95
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Water quality monitors measure and regulate electrical conductivity (EC) and total dissolved solids (TDS) in the water supply. In-line monitors have extended measurement ranges and easily attach to your current water supply line. Measuring TDS levels in your tap (feed) water and purified (product) water, as well as waterflow and volume, helps you determine the safely of your water.