Handheld Meters
Pocket and handheld TDS Meters measure the level of total dissolved solids (TDS) in your water and monitor the performance of a reverse osmosis (RO) membrane.
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HM Digital TDS-3 Handheld TDS Meter With Thermometer
Default Title - $12.90
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Handheld TDS Meter EZ
Single - $15.99
5-Pack - $78.35
10-Pack - $153.50
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HM Digital PH-80 Handheld pH / Temp Meter
Default Title - $28.34
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HM Digital COM-80 EC/TDS Combo Meter
Default Title - $25.76
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Handheld TDS Meter ZT-2
Default Title - $12.07
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HM Digital COM-100 HMDCOM100 Waterproof EC/TDS And Amp Temperature Combo Meter, White/Purple
Default Title - $49.89
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ORP-200 Waterproof ORP Meter
Default Title - $69.19
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pH / Temp Meter Waterproof
Default Title - $62.83
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HM Digital HydroMaster Continuous pH/EC/TDs/Temperature Monitor
Default Title - $226.26
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AquaPro Upscale Consumer TDS/Temp Meter
Default Title - $19.48
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Handheld UV Light NVF-4
Default Title - $18.50
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Pocket Size TDS Meter w/Thermometer
Default Title - $23.25
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HM Digital TDS-4 Pocket Size TDS Meter
Default Title - $19.46
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DX-2 Handheld Radiation Monitor (0-100 mR/hr)
10 Pack - $2,725.93
Single - $286.94
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COM-360: Waterproof Professional Series pH/EC/TDS/Temp Meter
Single - $116.50
2-Pack - $219.02
5-Pack - $512.60
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COM-300: Waterproof Professional Series pH/EC/TDS/Temp Meter
Single - $102.00
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Handheld EC & Temp Meter w/ case
Default Title - $20.00
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Hanna Instruments HI98129 pH, TDS, EC, and Temp Combo Meter
Default Title - $175.71
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HM Digital SB-1500PRO Digital Salinity and Temperature Meter
Default Title - $65.89
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AquaPro Upscale Consumer EC/Temp Meter
Default Title - $27.45
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HM Digital SCM-1000 Sugar Refractometer
Default Title - $210.61
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HM Digital TM-1 Digital Thermometer
Default Title - $24.86
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Hanna Instruments HI98121 pH & ORP Combo Meter
Default Title - $209.69
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DX-1 Handheld Radiation Monitor (0-10 mR/hr)
Single - $250.00
10 Pack - $2,375.00
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Extech EX900-R ExStik 4-in-1 Chlorine, pH, ORP and Temp Handheld Meter Kit
Default Title - $277.39
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Extech CL200 ExStik Chlorine Handheld Meter
Default Title - $186.99
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Mirion SOR/RF LCD Radiation Detector Dosimeter
Default Title - $490.00
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Mirion RAD-60 LCD Radiation Detector Dosimeter
Default Title - $557.14
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Mirion DMC-2000X LCD Radiation Detector Monitor
Default Title - $619.99
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Mirion DMC-2000S LCD Radiation Detector Monitor
Default Title - $528.57
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HM Digital RCM-1000BT Coffee Refractometer
Default Title - $339.99
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ADR-1 Dosimeter Reader Head for RAD-60
Default Title - $1,238.90
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Arsenic Quick Scan 481305
Default Title - $2,555.75
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HM Digital TDS-3 Handheld TDS Meter With Thermometer
Default Title - $12.90
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Handheld TDS Meter EZ
Single - $15.99
5-Pack - $78.35
10-Pack - $153.50
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HM Digital PH-80 Handheld pH / Temp Meter
Default Title - $28.34
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HM Digital COM-80 EC/TDS Combo Meter
Default Title - $25.76
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Handheld TDS Meter ZT-2
Default Title - $12.07
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HM Digital COM-100 HMDCOM100 Waterproof EC/TDS And Amp Temperature Combo Meter, White/Purple
Default Title - $49.89
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ORP-200 Waterproof ORP Meter
Default Title - $69.19
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pH / Temp Meter Waterproof
Default Title - $62.83
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HM Digital HydroMaster Continuous pH/EC/TDs/Temperature Monitor
Default Title - $226.26
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AquaPro Upscale Consumer TDS/Temp Meter
Default Title - $19.48
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Handheld UV Light NVF-4
Default Title - $18.50
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Pocket Size TDS Meter w/Thermometer
Default Title - $23.25
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HM Digital TDS-4 Pocket Size TDS Meter
Default Title - $19.46
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DX-2 Handheld Radiation Monitor (0-100 mR/hr)
10 Pack - $2,725.93
Single - $286.94
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COM-360: Waterproof Professional Series pH/EC/TDS/Temp Meter
Single - $116.50
2-Pack - $219.02
5-Pack - $512.60
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COM-300: Waterproof Professional Series pH/EC/TDS/Temp Meter
Single - $102.00
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Handheld EC & Temp Meter w/ case
Default Title - $20.00
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Hanna Instruments HI98129 pH, TDS, EC, and Temp Combo Meter
Default Title - $175.71
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HM Digital SB-1500PRO Digital Salinity and Temperature Meter
Default Title - $65.89
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AquaPro Upscale Consumer EC/Temp Meter
Default Title - $27.45
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HM Digital SCM-1000 Sugar Refractometer
Default Title - $210.61
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HM Digital TM-1 Digital Thermometer
Default Title - $24.86
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Hanna Instruments HI98121 pH & ORP Combo Meter
Default Title - $209.69
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DX-1 Handheld Radiation Monitor (0-10 mR/hr)
Single - $250.00
10 Pack - $2,375.00
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Extech EX900-R ExStik 4-in-1 Chlorine, pH, ORP and Temp Handheld Meter Kit
Default Title - $277.39
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Extech CL200 ExStik Chlorine Handheld Meter
Default Title - $186.99
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Mirion SOR/RF LCD Radiation Detector Dosimeter
Default Title - $490.00
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Mirion RAD-60 LCD Radiation Detector Dosimeter
Default Title - $557.14
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Mirion DMC-2000X LCD Radiation Detector Monitor
Default Title - $619.99
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Mirion DMC-2000S LCD Radiation Detector Monitor
Default Title - $528.57
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HM Digital RCM-1000BT Coffee Refractometer
Default Title - $339.99
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ADR-1 Dosimeter Reader Head for RAD-60
Default Title - $1,238.90
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Arsenic Quick Scan 481305
Default Title - $2,555.75
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Want to learn more?
Handheld meters are ideal for all consumer and commercial water purification applications, including waste water regulation, aquaculture, hydroponics, and more. Total Dissolved Solids (TDS) are the total amount of mobile charged ions, including minerals, salts, or metals, dissolved in a given volume of water expressed in units of mg per unit volume (mg/L) or parts per million (ppm).
How Does a TDS Meter Work?
A TDS meter or tester monitors the amount of current passing between the two electrodes to find how many ions are in solution and allows you to calculate the TDS reading. Applying a voltage between two or more electrodes causes the negatively charged ions to move towards the positive ones, while the positively charged ions move towards the negative ones.
Tips for Using a TDS Meter
Rinse the end of the TDS meter that will be submerged in water with fresh water. Build-up of salts on the meter will interfere with proper operation and skew the readings.
Be careful not to touch the TDS electrode surfaces with your hands or an abrasive cloth. To clean the TDS electrodes, soak the tips in vinegar or diluted hydrochloric acid (muriatic acid) and rinse them well with water. Check your TDS meter handbook for individual cleaning methods.
If you are using a TDS meter to monitor the performance of an RO membrane, then the TDS measurement should decrease from the original number by at least a factor of 10. For example, if your tap water is 231 ppm, then the water from your RO system should be less than 23 ppm. A decrease less than a factor of 10 usually indicates a problem with the RO membrane.
How Does a TDS Meter Work?
A TDS meter or tester monitors the amount of current passing between the two electrodes to find how many ions are in solution and allows you to calculate the TDS reading. Applying a voltage between two or more electrodes causes the negatively charged ions to move towards the positive ones, while the positively charged ions move towards the negative ones.
Tips for Using a TDS Meter
Rinse the end of the TDS meter that will be submerged in water with fresh water. Build-up of salts on the meter will interfere with proper operation and skew the readings.
Be careful not to touch the TDS electrode surfaces with your hands or an abrasive cloth. To clean the TDS electrodes, soak the tips in vinegar or diluted hydrochloric acid (muriatic acid) and rinse them well with water. Check your TDS meter handbook for individual cleaning methods.
If you are using a TDS meter to monitor the performance of an RO membrane, then the TDS measurement should decrease from the original number by at least a factor of 10. For example, if your tap water is 231 ppm, then the water from your RO system should be less than 23 ppm. A decrease less than a factor of 10 usually indicates a problem with the RO membrane.