(COM-100) (TDS-EZ) (TDS-3) (TDS-4)
(AP-1) (pH-200) (COM-300) (ORP-200)
(DM-1) (DM-2)
(QC1) (PSC-150)
HM Digital water quality testing instruments are superior in construction and performance,
yet made available at a very economic cost. HM Digital, Inc. is the only manufacturer of economical
in-line dual TDS meters that measure total dissolved solids (TDS) levels of feed and product water lines
simultaneously, an effective way to compare rejection rates and gauge reverse osmosis membrane,
water filter and water purification performance.
Hand Held TDS Meters
| Part # | Description | 1+ | 10+ | 25+ | 50+ | |
| COM-100 | EC/TDS/TEMP WATERPROOF METER | $56.03 | $53.12 | $50.21 | $46.57 | |
| TDS-3 | TDS & TEMP METER W/CASE; 0-9990ppm | $9.82 | $9.31 | $8.80 | $8.16 | |
| TDS-4 | POCKET SIZE TDS METER; 0-9990ppm w/ATC | $14.09 | $13.36 | $12.63 | $11.71 | |
| TDS-EZ | ECONOMY TDS METER; 0-9990 PPM | $12.49 | $11.85 | $11.20 | $10.39 | |
| AP-1 | AQUAPRO TDS METER 0-5000 PPM | $18.79 | $17.81 | $16.83 | $15.61 |
Hand Held pH Meter
| Part # | Description | 1+ | 10+ | 25+ | 50+ | |
| PH-200 | WATERPROOF PH METER | $73.62 | $69.80 | $65.98 | $61.20 | |
| COM-300 | PH/EC/TDS/TEMP WATERPROOF METER | $113.12 | $107.24 | $101.37 | $94.02 |
Hand Held ORP Meter
| Part # | Description | 1+ | 10+ | 25+ | 50+ | |
| ORP-200 | HAND HELD WTR/PRF ORP METER | $83.21 | $78.89 | $74.57 | $69.16 |
Continuous Monitors
| Part # | Description | 1+ | 5+ | 25+ | 50+ | |
| DM-2 | INLINE DUAL TDS METER COMMERCIAL | $38.90 | $36.88 | $34.86 | $32.33 |
| Part # | Description | 1+ | 10+ | 25+ | 50+ | |
| QC1 | QUICK CHECK TDS/COND MONITOR | $20.49 | $19.42 | $18.36 | $17.03 | |
| DM-1 | IN-LINE DUAL TDS METER; 1/4″ JG | $28.26 | $26.79 | $25.32 | $23.49 | |
| DM-1A | IN-LINE DUAL TDS METER; 3/8″ JG | $24.95 | $23.66 | $22.36 | $20.74 |
| Part # | Description | 1+ | 5+ | 10+ | 25+ | |
| PSC-150 | EXTENDED RANGE TDS/EC CONTROLLER | $169.01 | $160.23 | $151.45 | $140.48 |