Go Direct® Sensor Clamp

The Go Direct Salinity Sensor precisely measures the total dissolved salt content of ocean or brackish water. This probe connects via Bluetooth® wireless technology or via USB to your device. Specifications Range of Salinity Sensor: 0 to 50 ppt (0 to 50,000 ppm) Accuracy (factory calibration):+/-1.5 ppt below 35 ppt +/-5.0 ppt above 35 ppt Accuracy (user calibration):+/- 0.5 ppt within user-calibrated range Temperature compensation: automatic from 5 to 35°C, can be turned off Temperature range (can be placed in): 0 to 80°C Description: dip type, abs body, parallel graphite electrodes Dimensions: 12 mm OD and 150 mm length What's included Go Direct Salinity Sensor Micro USB Cable User Manual - GDX-SAL

Shipping in June 2026The Go Direct Air Quality Sensor helps students investigate real‑world questions about the quality of the air we breathe with measurable evidence—right where they live and learn.Designed for high school and college use, this durable sensor supports indoor and outdoor monitoring so students can track pollutants over time, analyze spatial patterns, and connect air quality to human and ecological health.Make air quality tangible, local, and measurable for students. The Go Direct Air Quality Sensor transforms air quality from an abstract concept into measurable evidence in a classroom-ready form. It equips educators and students with the tools needed to investigate pollution scientifically, think systemically, and understand how environmental conditions directly affect human and ecological health—right where they live and learn. Includes 3 AP- and NGSS-Aligned LessonsUsing the Sensor: Learn different channels, remote data collection, and basic analysis. Indoor Air Quality Investigation: Analyze indoor air quality data and develop recommendations to improve it. Traffic and Outdoor Air Quality: Investigate how vehicle traffic affects air pollution. Extended Investigation Ideas Compare indoor and outdoor air quality. Monitor particulate matter near roads, parking lots, or green spaces. Analyze air quality changes during traffic peaks or daily weather shifts. Observe ozone trends on sunny vs. cloudy days. Investigate how different types of cooktops affect CO2 and PM levels. Measures Key Air Pollutants Particulate Matter (PM1, PM2.5, and PM10) Ground-Level Ozone (O3) Nitrogen Dioxide (NO2) Sulfur Dioxide (SO2) Carbon Dioxide (CO2) Volatile Organic Compound Index (VOC Index) Measures Environmental Conditions Temperature Relative Humidity Barometric and Station Pressure Key FeaturesReal-time air quality data collection via Bluetooth® wireless technology Remote data logging for long-term or remote investigations, no connection required Integrated Global Navigation Satellite System (GNSS) allows for geotagging Durable for indoor and outdoor use Remote Data Logging—Go Beyond Wireless Limits! This Go Direct sensor is capable of remote data logging! This feature allows sensors to store data directly to their internal memory—ideal for investigations that extend beyond typical connection ranges like long-term environmental monitoring or rocket launches. It works seamlessly with our award-winning Vernier Graphical Analysis® app so students can visualize their data and make key connections between abstract science concepts and real-world phenomena. Learn more about remote data logging. Rechargeable Battery—Ready When You Are The robust rechargeable battery offers long battery life and provides always-ready operation when using the sensor wirelessly. Monitor battery life directly from our award-winning Vernier Graphical Analysis® app, as well as LabQuest® 3. Should the battery run low, simply connect the sensor to the charging cable and keep on collecting—no interruptions or inconvenience to you or your students. Wireless or Wired—The Flexibility to ChooseOur Go Direct sensors connect directly to your mobile device, Chromebook™, or computer using our Vernier Graphical Analysis® app—no additional equipment or software purchases are necessary. Go Direct sensors can be used wired via USB or wirelessly via Bluetooth® wireless technology, allowing you to choose the best solution for your classroom or laboratory.Go Direct Air Quality has the following channels PM1.0PM2.5PM10CO2NO2SO2O3VOC IndexTemperatureRelative HumidityBarometric PressureStation PressureLatitudeLongitudeAltitudeSpecificationsPM Mass Concentration Specified Range: 0–1000 µg/m3PM1 size range: 0.3–1µgPM2.5 size range: 0.3–2.5µgPM10 size range: 0.3–10µgCO2 Range: 0–5,000 ppmNO2 Range: 0-2000ppb SO2 Range: 0-2000ppbO3 Range: 0-2000ppbVOC Index: 1–500Temperature Range: 10–40℃ (-10℃ min, 50℃ max short term)Relative Humidity Range: 20–80% (10% min, 90% max short term)Station Pressure Range: 260–1260hPaMaximum sampling rate: 1 sample/s

The Go Direct Temperature Probe is a rugged, general-purpose sensor that students can use to monitor temperature. It connects via Bluetooth® wireless technology or via USB to your device. Save money when you purchase the Go Direct Temperature Teacher Pack, which includes 8 Go Direct Temperature Probes and a Go Direct® Charge Station. Specifications Range: –40 to 125°C Handle range: –10 to 45°C Resolution: 0.01°C Accuracy: ±0.25°C Response time (time for 90% of reading): 20 seconds (in water, with stirring) Connections:Wireless: Bluetooth Wired: USB What's included Go Direct Temperature Go Direct Temperature Probe Micro USB Cable Quick-start guide Go Direct Temperature Teacher Pack 8 Go Direct Temperature Probes Charge Station 8 Micro USB Cables Quick-start guide User Manual - GDX-TMP

The Go Direct pH Sensor is a general-purpose pH sensor used to monitor pH of aqueous solutions. It connects via Bluetooth® wireless technology or via USB to your device. Save money when you purchase the Go Direct pH Teacher Pack, which includes 8 Go Direct pH Sensors and a Go Direct® Charge Station. Specifications pH range: 0–14 Accuracy with new electrode (pH): ±0.2 Type: Sealed, gel-filled, polycarbonate body, Ag/AgCl reference, single junction Shaft diameter: 12 mm OD Storage solution: pH-4/KCl solution (10 g KCl in 100 mL buffer pH-4 solution) Connections:Wireless: Bluetooth Wired: USB What's included Go Direct pH Go Direct pH Sensor (includes Go Direct Electrode Amplifier) pH storage solution bottle with pH storage solution Micro USB Cable Quick-start guide Go Direct pH Teacher Pack 8 Go Direct pH Sensors 8 pH storage solution bottles with pH storage solution Charge Station 8 Micro USB Cables Quick-start guide User Manual - GDX-PH

The Go Direct Optical Dissolved Oxygen Probe makes it easy to measure dissolved oxygen concentration, water temperature, and atmospheric pressure. It connects via Bluetooth® wireless technology or via USB to your device. Specifications Range: 0 to 20 mg/L, 0 to 300% Accuracy:mg/L±0.2 mg/L below 10 mg/L ±0.4 mg/L above 10 mg/L %±2% below 100% ±5% above 100% Response Time: 90% of final reading in 40 seconds Temperature Range: automatic from 0 to 50°C Pressure Range: automatic from 228 mmHg to 1519 mmHg Minimum sample flow: none required What's included Go Direct® Optical Dissolved Oxygen Probe Micro USB Cable User Manual - GDX-ODO

The Go Direct Nitrate Ion-Selective Electrode (ISE) can be used to measure the concentration of nitrate (NO3-) in aqueous samples. It connects via Bluetooth® wireless technology or via USB to your device. Specifications Range (mV): ±1000 mV Range (concentration): 1 to 14,000 mg/L (or ppm) Accuracy: ±10% of full scale (calibrated 1 to 100 mg/L) Interfering ions: ClO4–, I–, ClO3–, F– pH range: 2.5–11 (no pH compensation) Temperature range: 0–40°C (no temperature compensation) Electrode slope: –55 ±3 mV/decade at 25°C Electrode resistance: 0.1 to 5 MΩ Minimum sample size: must be submerged 2.8 cm (1.1 in) Connections:Wireless: Bluetooth Wired: USB What's included Go Direct ISE Amplifier attached to a Go Direct Nitrate Ion-Selective Electrode BNC Micro USB cable 30 mL bottle of High Standard solution with SDS (100 mg/L or 100 ppm NO3–) 30 mL bottle of Low Standard solution with SDS (1 mg/L or 1 ppm NO3–) Short-Term ISE Soaking Bottle User Manual - GDX-NO3

The Go Direct Calcium Ion-Selective Electrode (ISE) can be used to measure the concentration of calcium (Ca2+) in aqueous samples. It connects via Bluetooth® wireless technology or via USB to your device. Specifications Range (mV): ±1000 mV Range (concentration): 1 to 40,000 mg/L (or ppm) Accuracy: ±10% of full scale (calibrated 10 to 1000 mg/L) Interfering ions: Pb2+, Hg2+, Si2+, Cu2+, Ni2+, NH3, Na+, Li+, K+, Ba2+, Zn2+, Mg2+ pH range: 2–8 (no pH compensation) Temperature range: 0–40°C (no temperature compensation) Electrode slope: 26 ±2 mV/decade at 25°C Electrode resistance: 100 MΩ Minimum sample size: must be submerged 2.8 cm (1.1 in) Connections:Wireless: Bluetooth Wired: USB What's included Go Direct ISE Amplifier attached to a Go Direct Calcium Ion-Selective Electrode BNC Micro USB cable 30 mL bottle of High Standard solution with SDS (1000 mg/L or 1000 ppm Ca2+) 30 mL bottle of Low Standard solution with SDS (10 mg/L or 10 ppm Ca2+) Short-Term ISE Soaking Bottle User Manual - GDX-CA

The Go Direct Potassium Ion-Selective Electrode (ISE) can be used to measure the concentration of potassium (K+) ions in aqueous solutions. It connects via Bluetooth® wireless technology or via USB to your device. Specifications Range (mV): ±1000 mV Range (concentration): 1 to 39,000 mg/L (or ppm) Accuracy: ±11% of full scale (calibrated 10 to 1000 mg/L) Interfering ions: Cs+, NH4+, H+, Ag+, Li+, Na+ pH range: 2–12 (no pH compensation) Temperature range: 0–40°C (no temperature compensation) Electrode slope: 56 ±3 mV/decade at 25°C Electrode resistance: 100 to 200 kΩ Minimum sample size: must be submerged 2.8 cm (1.1 in) Connections:Wireless: Bluetooth Wired: USB What's included Go Direct ISE Amplifier attached to a Potassium Ion-Selective Electrode BNC Micro USB cable 30 mL bottle of High Standard solution with SDS (1000 mg/L or 1000 ppm K+) 30 mL bottle of Low Standard solution with SDS (10 mg/L or 10 ppm K+) Short-Term ISE Soaking Bottle User Manual - GDX-K

The Go Direct 3-Axis Magnetic Field Sensor allows you to determine the magnitude and direction of the magnetic field at any point in space. It connects via Bluetooth® wireless technology or via USB to your device. Specifications Measurement range: ±5 mT and ±130 mT Operating temperature: –40°C to 85°C Resolution: 0.01 mT or better Dimensions: 19 cm long, wand portion 12.2 cm long. Wand tapers from 0.8 cm square at handle to 0.7 cm square at tip. Designed to be placed inside a solenoid if needed. Calibration: Factory-calibrated, user does not need to calibrate. Connections:Wireless: Bluetooth Wired: USB What's included Go Direct 3-Axis Magnetic Field Sensor Micro USB Cable User Manual - GDX-3MG

The Go Direct Conductivity Probe determines the ionic content of an aqueous solution by measuring its electrical conductivity. It connects via Bluetooth® wireless technology or via USB to your device. Specifications Range: 0 to 20,000 μS/cm (0 to 10,000 mg/L TDS) Accuracy using factory calibration: ±1% of full scale reading (valid for 1 to 10,000 µS/cm) Temperature compensation: Automatic from 5 to 35°C, can be turned off Temperature range (can be placed in): 0 to 80°C Cell constant: 1.0 cm-1 Resolution: 0.01 µS/cm Description: ABS body, parallel carbon (graphite) electrodes Dimensions: 12 mm OD and 12 cm length Connections:Wireless: Bluetooth Wired: USB What's included Go Direct Conductivity Probe Micro USB Cable User Manual - GDX-CON

Connect the Go Direct® Nitrate Ion-Selective Electrode BNC to our Go Direct® Ion-Selective Electrode Amplifier to measure the potential (mV) and calculate the concentration of nitrate (NO3-) ions in aqueous samples. Specifications Range (mV):Go Direct® Ion-Selective Electrode Amplifier: -1000 mV to +1000 mV Range (concentration): 1 to 14,000 mg/L (or ppm) Reproducibility (precision): ±30mV Interfering ions: ClO4–, I–, ClO3–, F– pH range: 2.5–11 (no pH compensation) Temperature range: 0–40°C (no temperature compensation) Electrode slope: -55 ±3 mV/decade at 25°C Electrode resistance: 0.1 to 5 MΩ Minimum sample size: must be submerged 2.8 cm (1.1 in) What's included Go Direct Nitrate Ion-Selective Electrode with BNC terminated end, packed with a storage bottle 30 mL bottle of High Standard solution with SDS (1000 mg/L NO3–) 30 mL bottle of Low Standard solution with SDS (10 mg/L NO3–) Short-Term ISE Soaking Bottle User Manual - GDX-NO3-BNC

The Go Direct® Tris-Compatible Flat pH Sensor is a general-purpose pH sensor used to measure the pH of a solution or semisolid, such as food or soil. It connects via Bluetooth® wireless technology or via USB to your device. Specifications Range: pH 0–14 (Some sodium error in ranges greater than pH 12 due to thicker glass and higher impedance values) Electrode type: Double-junction, sealed, gel-filled, Ag/AgCl reference, polycarbonate body Membrane style: Flat glass Storage solution: pH 4/KCl solution (10 g KCl in 100 mL buffer pH-4 solution) What's included Go Direct Tris-Compatible Flat pH Electrode BNC Go Direct Electrode Amplifier pH storage solution bottle with pH Storage Solution Micro USB cable User Manual - GDX-FPH

The Go Direct Ammonium Ion-Selective Electrode (ISE) can be used to measure the concentration of ammonium (NH4+) in aqueous samples. It connects via Bluetooth® wireless technology or via USB to your device. Specifications Range (mV): ±1000 mV Range (concentration): 1 to 18,000 mg/L (or ppm) Accuracy: ±10% of full scale (calibrated 1 to 100 mg/L) Interfering ions: K+, Li+, Na+, Cs+, Mg2+, Ca2+, Sr2+, Ba2+ pH range: 2–7 (no pH compensation) Temperature range: 0–40°C (no temperature compensation) Electrode slope: 55 ±3 mV/decade at 25°C Electrode resistance: 0.1 to 5 MΩ Minimum sample size: must be submerged 2.8 cm (1.1 in) Connections:Wireless: Bluetooth Wired: USB What's included Go Direct ISE Amplifier attached to a Go Direct Ammonium Ion-Selective Electrode BNC Micro USB cable 30 mL bottle of High Standard solution with SDS (100 mg/L or 100 ppm NH4+ as N) 30 mL bottle of Low Standard solution with SDS (1 mg/L or 1 ppm NH4+ as N) Short-Term ISE Soaking Bottle User Manual - GDX-NH4