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Thermo Scientific™ Orion Star™ A121 Portable pH Meter
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Supports traceability with guaranteed access to certificates and proactive change notifications.
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Take simple pH and temperature measurements with our portable pH meter with easy operation for basic field testing.
Memory | Non-volatile memory preserves log and settings |
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Resolution (pH) | 0.01, 0.1 |
Languages | English |
Measurement Modes | pH,mV,Relative mV with Temperature |
Range (pH) | -2 to 16 |
Channels | 1 |
Accuracy (pH) | ±0.01 |
Power Supply | 4 AA batteries (included) or universal AC adapter (sold separately) |
Battery Life | 2000 hr. |
Data Management Details | Internal Data Point Memory |
Display Type | LCD |
Resolution (mV) | 0.1mV |
Data Points | 50 |
Certifications/Compliance | CE, TUV 3-1, FCC Class A |
Temperature Probe Calibration | 1 point temperature offset calibration |
Inputs | BNC (pH or ORP electrode), 8 pin MiniDIN (ATC temperature probe) |
Accuracy (Temperature) | ±0.1°C |
Weight (Metric) | 0.5 kg |
Accuracy (mV) | ±0.2 or ±0.05%, whichever is greater |
Stability | Smart Stability and Smart Averaging |
Warranty | 3 Year Meter Warranty |
Temperature (English) Operating | 41°F to 113°F (ambient) |
Isopotential Point | 7.00pH |
AC Adapter | Universal 50-60 Hz, 100-240 VAC power adapter (sold separately, Cat. No. 1010003) |
Log Function Type | Automatic with Auto-Read Measure Mode, Manual with Continuous Measure Node |
Calibration | pH, relative mV (RmV) and temperature |
Battery Type | 4 x AA |
Relative Humidity Range | 5 to 85%, non-condensing |
Calibration Points | 1 to 3 |
Dimensions (L x W x H) | 24 cm x 10 cm x 6.5 cm (9.5 in. x 3.9 in. x 2.6 in.) |
IP Rating | IP-67 |
Temperature Selection | Manual or automatic with ATC temperature probe |
Keypad | Simple with highlighted measure key, scroll and shortcut keys |
Model | Orion Star A121 Portable pH/mV/RmV/Temperature Meter |
Outputs | None |
Range (Relative mV) | ±1999.9mV |
Temperature Range (English) | 22.0°F to 221.0°F |
Weight (English) | 2 lb. |
Resolution (Temperature) | 0.1°C, 0.1°F |
Temperature (Metric) Operating | 5°C to 45°C (ambient) |
Temperature Range (Metric) | -5°C to +105°C |
Range (mV) | ±1600.0 |
Mettler Toledo™ pH Meter SevenDirect SD20
The SevenDirect SD20 is an accurate and flexible benchtop meter for the determination of pH and ORP. The instrument is the replacement of the SevenCompact and is delivered with an EasyPlace sensor arm.
Memory | 2000 Standard Measurements |
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Resolution (pH) | 0.001, 0.01, 0.1 |
Accuracy (pH) | 0.002 |
Dimensions (L x W x H) | 195 x 205 x 65 mm |
Data Management Details | PC, Printer, USB Stick |
Display Type | TFT, 7 in. Color |
IP Rating | IP54 |
Temperature Range (English) | -22°F to +266°F |
Weight (English) | 1.9 lb. |
Resolution (Temperature) | 0.1°C |
Temperature Range (Metric) | -30°C to +130°C |
Range (mV) | -2000 to 2000 mV |
Accuracy (Temperature) | ±0.1°C between 0°C and 100°C |
Weight (Metric) | 850 g |
METTLER TOLEDO™ SevenExcellence™ S400 Benchtop pH Meter
The S400 meter measures pH, redox/ORP, and ISFET. It can be expanded with additional modules to measure conductivity, resistivity, DO, BOD, ISE, salinity, and TDS. It has an intuitive touchscreen, the ability to create measurement shortcuts, and can export data to a printer, Excel, or LIMS system.
Accuracy (mV) | ±0.1 |
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Resolution (Conductivity) | 0.001 to 1 |
Range (Conductivity) | 0.001μS/cm to 2000mS/cm |
Resolution (pH) | 0.001, 0.01, 0.1 |
Range (pH) | -2 to 20 |
Accuracy (pH) | ±0.002 |
Display Type | TFT |
Resolution (mV) | 0.1/1mV |
Outputs | USB, RS-232, Ethernet |
Data Points | 20000 |
Calibration Points (pH) | Max. 5 points, 8 pre-defined and 20 user-defined buffer group |
Resolution (Temperature) | 0.1°C |
Temperature Range (Metric) | -30°C to +130°C |
Range (mV) | -2000 to 2000 |
Accuracy (Temperature) | ±0.1°C |
Calibration Points (Conductivity) | 13 pre-defined and 20 user-defined standard |
Testo™ 206-pH2 pH Meter
Ideal for measuring the pH value of semi-solid media, viscous and protein-containing foodstuffs and water-mixed solid cooling lubricants.
Fisherbrand™ Handheld pH/ORP meter Accumet AE6AK, in carrying case
Fisherbrand Handheld pHmeter Accumet AE6AK, in carrying case.
Mettler Toledo™ FiveEasy™ Plus FP20 pH/mV Meters
Compact, benchtop meter provides high quality pH/mV measurements with simple click of a button.
Accuracy (mV) | ±1 |
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Memory | 200 measurements, current calibration |
Resolution (pH) | 0.01, 0.1 |
Range (pH) | -2.00 to 16.00 |
Calibration | Linear/Segmented |
Accuracy (pH) | ±0.01 |
Temperature Compensation | ATC and MTC |
Dimensions (L x W x H) | 22.7 x 14.7 x 7 cm (9 x 5.7 x 2.7 in.) |
Data Management Details | RS232, USB |
Display Type | LCD |
Voltage | 120/240 V |
Resolution (mV) | 1mV |
Frequency | 50/60 Hz |
Temperature Range (English) | 23°F to 221°F |
Weight (English) | 1.4 lb. |
Resolution (Temperature) | 0.1°C |
Temperature Range (Metric) | -5°C to +105°C |
Range (mV) | 2000 to 2000 |
Inputs | BNC, Cinch, NTC 30kiloOhm sensors |
Accuracy (Temperature) | 0.3°C |
Weight (Metric) | 0.63 kg |
Mettler Toledo™ pH/Conductivity Meter SevenDirect SD23
The SevenDirect SD23 is an accurate and flexible benchtop meter for the determination of pH and conductivity - either separately or simultaneously. The instrument is the replacement of the SevenCompact and is delivered with an EasyPlace sensor arm.
Accuracy (mV) | 0.1 mV |
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Temperature Accuracy | ±0.1°C between 0°C and 100°C |
Memory | 2000 Standard Measurements |
Range (Conductivity) | 0.001 μS/cm to 2000 mS/cm |
Resolution (pH) | 0.1, 0.01, 0.001 |
Channels | Dual-channel |
Accuracy (pH) | 0.002 |
Dimensions (L x W x H) | 195 x 205 x 65 mm |
Data Management Details | PC, Printer, USB Stick |
Display Type | Color TFT |
IP Rating | IP54 |
Accuracy (Conductivity) | 0.5 % |
Resolution (mV) | 1, 0.1 mV |
Temperature Range (English) | -22°F to +266°F |
Weight (English) | 1.9 lb. |
Temperature Range (Metric) | -30°C to +130°C |
Range (mV) | -2000 to 2000 mV |
Weight (Metric) | 850 g |
Temperature Resolution | 0.1°C |
Resolution (ORP) | 1, 0.1 |
METTLER TOLEDO™ Portable pH/Conductivity/Dissolved Oxygen/Ion Meters
Water and dust proof, IP67 rated meter for portable or field measurements. Portable meters compatible with pH, conductivity, dissolved oxygen, and ion selective electrodes.
IP Rating | IP 67 |
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Certifications/Compliance | ISO 9001, ISO 14001 |
METTLER TOLEDO™ SevenExcellence™ S700 Conductivity Benchtop Meter
The S700 meter measures conductivity, resistivity, TDS, and salinity. Its capabilities can be expanded with additional modules to measure pH, dissolved oxygen, ISE, BOD, Redox/ORP, and ISFET. Features an intuitive touchscreen and the ability to create measurement shortcuts.
Calibration Points | 13 Pre defined and 20 user defined standard |
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Temperature Compensation | 20°C |
Range (Resistivity) | 0.01 to 100 megohm/cm |
Range (Conductivity) | 0.001 μS/cm to 2000 mS/cm |
Accuracy (Conductivity) | ±0.5% |
Sensor Types | Conductivity |
Data Points | At least 20000 data points, 250 analyses |
Range (TDS) | 0.001 mg/L to 1000 g/L |
Resolution (Temperature) | 0.1°C |
Temperature Range (Metric) | -30°C to +130°C |
Inputs | Integrated interfaces (USB, RS232 and Ethernet) |
Accuracy (Temperature) | ±0.1°C |
Range (Salinity) | 0 to 80 psu |
Mettler Toledo™ S975 SevenExcellence™ pH/Conductivity/Ion/DO Meter Kit
Professional modular triple-channel instrument for measuring ion concentrations, pH, mV/ORP, rel. mV, conductivity, salinity, TDS, resistivity and conductivity ash
Jenway™ 550 portable pH meter supplied in carry case with epoxy combination pH electrode, ATC probe and batteries
550 portable pH meter supplied in carry case with epoxy combination pH electrode, ATC probe and batteries. A small, lightweight general purpose pH meter offering 2 point pH calibration and automatic buffer recognition. Simultaneously displays both the temperature compensated pH readings and temperature.
METTLER TOLEDO™ SevenExcellence™ S470 pH/Conductivity Benchtop Meter
The S470 meter measures pH, conductivity, resistivity, redox/ORP, TDS, salinity, and ISFET. It can be expanded with additional modules to measure dissolved oxygen, BOD, and ISE. It has an intuitive touchscreen, measurement shortcuts, and can export data to a printer, Excel file, or LIMS system.
Range (Resistivity) | 0.01 to 100megohm/cm |
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Resolution (pH) | 0.001/0.01/0.1 |
Range (pH) | -2 to 20 |
Resolution (ISE) | 0.001 to 1 |
Accuracy (pH) | ±0.002 |
Range (ISE) | 0 to 999999mg/L |
Range (Salinity) | 0 to 80 ppt |
Display Type | TFT |
Resolution (Salinity) | 0.001 to 1 |
Accuracy (Conductivity) | ±0.5% |
Resolution (mV) | 0.1/1mV |
Data Points | 20,000 |
Calibration Points (Conductivity) | 13 Pre defined and 20 user defined standard |
Accuracy (mV) | ±0.1mV |
Temperature Accuracy | ±0.1°C |
Calibration Points (ISE) | Max. 5 points, 8 pre defined and 20 user defined buffer group |
Resolution (Resistivity) | 0.001 to 1 |
Resolution (Conductivity) | 0.001μS/cm to 2000mS/cm |
Range (Conductivity) | 0.001 μS/cm to 2000 mS/cm |
Range (TDS) | 0.001 mg/L to 1000 g/L |
Resolution (TDS) | 0.001 to 1 |
Outputs | RS232, USB-A, USB-B, LAN, Mini-LTW, Mini-DIN, BNC, Cinch/RCA |
Calibration Points (pH) | Max. 5 points, 8 pre defined and 20 user defined buffer group |
Temperature Range (Metric) | -30°C to +130°C |
Range (mV) | -2000 to 2000 mV |
Temperature Resolution | 0.1°C |
METTLER TOLEDO™ SevenExcellence™ S500 pH/ISE Benchtop Meter
The S500 meter performs ion selective (ISE), pH, redox/ORP, and ISFET measurements. It can be expanded with additional modules to measure conductivity, resistivity, DO, salinity, TDS, and BOD. It has an intuitive touchscreen and the ability to create measurement shortcuts.
Range (Resistivity) | 0.001 μS/cm to 2000 mS/cm |
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Memory | 250 analyses (20.000 data points) |
Resolution (pH) | 0.001/0.01/0.1 |
Languages | Chinese, Chinese (TW), Croatian, Czech, Danish, Dutch, English (GB), English (US), French, German, Hungarian, Indonesian, Italian, Japanese, Korean, Norwegian, Polish, Portuguese (BR), Russian, Slovak, Slovenian, Spanish, Swedish, Thai, Turkish, Vietnamese |
Range (pH) | -2 to 20 |
Range (Concentration) | 0.001 to 999999mg/L ppm, 0.0001 to 100mol/L %, 0.001 to 100000mmol/L |
Resolution (ISE) | 0.001 to 1 |
Channels | Single-channel |
Accuracy (pH) | ±0.002 |
Range (ISE) | 0 to 999999mg/L |
Range (Salinity) | 0.001 μS/cm to 2000 mS/cm |
Display Type | TFT |
Resolution (Salinity) | 0.001 to 1 |
Resolution (mV) | 0.1/1mV |
Data Points | 20,000 |
Calibration Points (Conductivity) | 13 Pre defined and 20 user defined standard |
Accuracy (mV) | ±0.1mV |
Temperature Accuracy | ±0.1°C |
Calibration Points (ISE) | Max. 5 points, 8 pre defined and 20 user defined buffer group |
Resolution (Resistivity) | 0.001 to 1 |
Resolution (Conductivity) | 0.001 to 1 |
Accuracy (Concentration) | ±0.5% |
Range (Conductivity) | 0.001 μS/cm to 2000 mS/cm |
Range (TDS) | 0.001 μS/cm to 2000 mS/cm |
Resolution (TDS) | 0.001 to 1 |
Outputs | RS232, USB-A, USB-B, LAN, Mini-LTW, Mini-DIN, BNC, Cinch/RCA |
Calibration Points (pH) | Max. 5 points, 8 pre defined and 20 user defined buffer group |
Temperature Range (Metric) | -30°C to +130°C |
Range (mV) | -2000 to 2000 mV |
Temperature Resolution | 0.1°C |
METTLER TOLEDO™ SevenExcellence™ S475 pH/Conductivity/ISE Benchtop Meter
The S475 meter performs pH, conductivity, resistivity, ion selective, salinity, TDS, Redox/ORP, and ISFET measurements. It can be expanded with an additional module to measure DO/BOD. It has an intuitive touchscreen, measurement shortcuts, and can export data to a printer, Excel, or LIMS system.
Thermo Scientific™ Orion Star™ A221 Portable pH Meter
SureTRACE
Supports traceability with guaranteed access to certificates and proactive change notifications.
Learn More
Supports traceability with guaranteed access to certificates and proactive change notifications.
Learn More
Reliably measure pH, mV, ORP and temperature with our portable pH meter for advanced field analysis and printer or computer interfacing.