Solinst Model 107 TLC Meter for Temperature, Water Level and Conductivity
The Solinst Model 107 TLC Meter combines manual depth-to-water measurement with temperature and conductivity profiling in wells, boreholes, and open water. Temperature and conductivity appear on the reel-mounted LCD, while water level and probe depth are read from the laser-marked flat tape.
Designed for groundwater investigations and field monitoring, the 107 helps operators compare readings at selected depths to identify changes in water temperature and specific conductance. Choose an imperial configuration from 100 to 1,000 ft or a metric configuration from 30 to 300 m using the options on this page.
Three Measurements with One Instrument
- Water level: Measure depth to water from a consistent reference point using the graduated tape.
- Temperature: Read water temperature on the LCD while the probe is submerged.
- Conductivity: View temperature-compensated electrical conductivity to compare conditions at different depths or monitoring locations.
When the probe’s detection point enters conductive water, a light and tone activate briefly to indicate water contact. Read the tape at your reference point to determine depth to water. For profiling, lower the probe to selected depths and allow temperature and conductivity readings to stabilize before recording them.
Conductivity Profiling and Specific Conductance
The 107 displays conductivity standardized to 25°C, also called specific conductance and identified as EC on the display. This temperature compensation helps operators compare readings collected under different water temperature conditions.
The full conductivity display range is 0 to 80,000 µS/cm, with a calibrated range of 500 to 80,000 µS/cm. Manufacturer-stated conductivity accuracy is ±5% of the reading or ±100 µS/cm, whichever is greater. A displayed value below the calibrated range should not be assumed to carry the same accuracy specification.
Conductivity profiles can support saltwater intrusion investigations, road salt impact studies, tracer tests, and assessments of changing groundwater conditions. Conductivity alone does not identify a specific contaminant, establish its concentration, or determine whether water is safe to drink.
Temperature Measurement
The meter displays temperature alongside conductivity, allowing operators to document both at each selected depth. Solinst specifies temperature accuracy of ±0.2°C over the -15°C to +50°C measurement range.
Allow sufficient time for the probe to equilibrate when moving between water zones with different temperatures. Recording readings before they stabilize can affect the usefulness of the resulting profile.
Submersible Probe and Laser-Marked Flat Tape
The 19 mm (3/4 in) diameter TLC probe is submersible to the full length of the meter’s tape. Check the available clearance along the entire access path, including restrictions around pumps, tubing, and fittings, before selecting this meter.
The PVDF flat tape has permanent laser markings every 1/100 ft on imperial configurations or every millimeter on metric configurations. Graduation spacing describes the distance between markings; it is separate from overall measurement accuracy.
The probe’s submergence rating does not apply to the reel. Keep the reel above water during use.
Field Operation and Conductivity Calibration
The portable reel includes an LCD, carrying handle, probe holder, brake, tape guide, and accessible battery drawer. A standard 9V alkaline battery provides up to 90 hours of use, and the electronics switch off after eight minutes of inactivity.
The meter supports one- to four-point manual conductivity calibration using the manufacturer’s specified standards. Check the probe in fresh calibration solution appropriate to your expected field range and follow the operating instructions for calibration, cleaning, and maintenance.
Applications for the Solinst 107 TLC Meter
- Manual groundwater level measurements
- Temperature and conductivity profiling in wells and open water
- Saltwater intrusion and salinity investigations
- Monitoring changes associated with road salt impacts
- Tracer studies
- Comparing water conditions at selected depths and monitoring locations
The Solinst 107 is a manually operated instrument and does not automatically log readings. Operators read the display and tape, then record the measurements for their project.
For help selecting tape length, measurement units, or quantities for your monitoring program, contact Activated Carbon Depot. We can confirm configuration availability and provide a quotation for multiple meters.
Solinst Model 107 TLC Meter Technical Specifications
| Specification | Details |
|---|---|
| Measurement functions | Manual depth-to-water measurement, temperature measurement, and conductivity profiling |
| Water level indication | A light and tone activate for approximately one second when the probe’s detection point enters conductive water |
| Depth measurement | Water level and probe depth are read manually from the tape |
| Display | Reel-mounted LCD showing conductivity and temperature |
| Full conductivity display range | 0 to 80,000 µS/cm |
| Calibrated conductivity range | 500 to 80,000 µS/cm |
| Conductivity accuracy | ±5% of reading or ±100 µS/cm, whichever is greater |
| Conductivity reporting | Specific conductance standardized to 25°C; displayed as EC |
| Conductivity temperature coefficient | 2.0% per °C |
| Temperature measurement range | -15°C to +50°C (5°F to 122°F) |
| Temperature accuracy | ±0.2°C (approximately ±0.4°F) |
| Probe diameter | 19 mm (3/4 in) |
| Probe submergence | Submersible to the full length of the meter’s tape |
| Tape | Laser-marked PVDF flat tape |
| Imperial graduations | LM2: feet and tenths, with markings every 1/100 ft |
| Metric graduations | LM3: meters and centimeters, with markings every millimeter |
| Imperial lengths listed | 100, 200, 300, 500, 750, and 1,000 ft |
| Metric lengths listed | 30, 60, 100, 150, 250, and 300 m |
| Power supply | 9V alkaline battery |
| Battery life | Up to 90 hours of use |
| Automatic shutoff | After eight minutes of inactivity |
| Conductivity calibration | One- to four-point manual calibration |
| Supported calibration standards | 1,413; 5,000; 12,880; and 80,000 µS/cm |
| Reel operating temperature | -20°C to +50°C |
| Submerged tape/probe operating temperature | -20°C to +60°C |
| Reel protection rating | IP64: dust-tight and protected against splashing water; not submersible |
| Wetted materials | PVDF, Santoprene, Delrin, Viton, 316 stainless steel, and platinum-plated copper |
| Automatic data logging | No; readings must be recorded manually |
Operating temperature limits are separate from the temperature measurement range. Conductivity readings below the calibrated range should not be assumed to carry the stated conductivity accuracy. Tape graduation spacing is separate from overall depth measurement accuracy.
Available Solinst 107 TLC Meter Models and Part Numbers
Each configuration below measures temperature, water level, and conductivity. Select the tape length and measurement units required for your monitoring procedures.
LM2 Imperial Models — Feet
Imperial tape is marked in feet and tenths, with graduations every 1/100 ft.
| Tape Length | Configuration | Solinst Part Number / SKU |
|---|---|---|
| 100 ft | 107 TLC / LM2 | 114796 |
| 200 ft | 107 TLC / LM2 | 114795 |
| 300 ft | 107 TLC / LM2 | 114794 |
| 500 ft | 107 TLC / LM2 | 114802 |
| 750 ft | 107 TLC / LM2 | 114801 |
| 1,000 ft | 107 TLC / LM2 | 114800 |
LM3 Metric Models — Meters
Metric tape is marked in meters and centimeters, with graduations every millimeter.
| Tape Length | Configuration | Solinst Part Number / SKU |
|---|---|---|
| 30 m | 107 TLC / LM3 | 114793 |
| 60 m | 107 TLC / LM3 | 114792 |
| 100 m | 107 TLC / LM3 | 114791 |
| 150 m | 107 TLC / LM3 | 114805 |
| 250 m | 107 TLC / LM3 | 114804 |
| 300 m | 107 TLC / LM3 | 114803 |
Before Ordering
- Choose a tape length that reaches your deepest planned profiling position, rather than only the current water surface.
- Select imperial or metric tape to match your reporting procedures. These are separate tape configurations.
- Confirm that the 19 mm (3/4 in) probe can pass through the full access path, including restrictions around installed equipment.
- Check that your expected conductivity values fall within the calibrated range required for your work.
- Match the selected length, units, and part number to your purchase order.
For assistance with configuration selection or project quantities, contact Activated Carbon Depot before ordering.
Solinst 107 TLC Meter vs. Standard Water Level Meters
Choose the 107 when your work requires temperature and conductivity readings in addition to depth to water. If you only need water level measurements or a dedicated drawdown alarm, another Solinst model may better match your procedure.
| Model | Measurement Functions | When to Choose It |
|---|---|---|
| Solinst 107 TLC | Manual depth to water, temperature, and conductivity profiling | When you need to compare temperature and specific conductance at selected depths |
| Solinst 101 P7 | Manual depth to water | When water level measurement is sufficient and you prefer laser-marked PVDF flat tape with a P7 probe |
| Solinst 101 P2 | Manual depth to water | When you prefer heat-embossed polyethylene flat tape and an easy-to-repair P2 probe |
| Solinst 102 P10 | Manual depth to water | When restricted access calls for a smaller 10 mm probe and narrow coaxial cable |
| Solinst 101D | Manual depth to water and selectable drawdown threshold detection | When you need an alarm as falling water exposes a probe positioned at a selected depth |
Does the 107 Replace a Water Quality Laboratory Test?
No. Conductivity helps identify changes in the electrical properties of water and can support investigations of salinity or other changes in dissolved ions. It does not identify individual contaminants, measure their specific concentrations, or establish drinking water safety.
Does the 107 Record Readings Automatically?
No. The 107 displays temperature and conductivity, while water level and probe depth are read from the tape. Operators record the readings manually. For unattended measurements over time, select a suitable datalogger separately.
What’s Included with the Solinst 107 TLC Meter?
- Assembled Solinst Model 107 TLC Meter with reel, TLC probe, and the selected tape length and measurement units
- 9V battery
- Tape guide
Sold Separately
The carrying case and conductivity calibration solutions are sold separately and are not included with the meter. Replacement parts and additional accessories are also sold separately unless explicitly listed in your order.
Before ordering, confirm your selected tape length, imperial or metric graduations, and Solinst part number.
Solinst 107 TLC Meter PDF Downloads
- Solinst Model 107 TLC Meter Data Sheet (PDF) — Features, specifications, applications, and configuration information.
- Solinst Model 107 Mk3 Operating Instructions (PDF) — Equipment checks, measurements, conductivity calibration, and troubleshooting.
Follow the operating instructions applicable to your meter’s hardware version. Review the calibration and stabilization procedures before collecting field measurements.
Solinst 107 TLC Meter Frequently Asked Questions
The Solinst 107 measures water temperature, depth to water, and electrical conductivity. Temperature and conductivity appear on the LCD, while water level and probe depth are read manually from the graduated tape.
No. Read depth to water and probe depth from the tape at your measurement reference point. The LCD displays temperature and conductivity.
A light and tone activate for approximately one second when the probe's detection point enters conductive water. Read the tape at your reference point to determine depth to water.
The full conductivity display range is 0 to 80,000 µS/cm. The calibrated range is 500 to 80,000 µS/cm. Readings below the calibrated range should not be assumed to carry the stated conductivity accuracy.
Solinst specifies conductivity accuracy as ±5% of the reading or ±100 µS/cm, whichever is greater, within the calibrated range. For example, at 1,000 µS/cm, the greater value is ±100 µS/cm; at 10,000 µS/cm, it is ±500 µS/cm.
The 107 displays conductivity standardized to 25°C, also called specific conductance. It is identified as EC on the display and uses a temperature coefficient of 2.0% per °C.
The temperature measurement range is -15°C to +50°C, equivalent to 5°F to 122°F. Manufacturer-stated temperature accuracy is ±0.2°C, approximately ±0.4°F.
No. Conductivity measurements can help identify changes in water conditions, but they do not identify individual contaminants or establish whether water is safe to drink. Use appropriate sampling and laboratory testing for those determinations.
Yes. The meter can be used to profile conductivity and temperature at selected depths during saltwater intrusion and salinity investigations. Interpret the readings alongside your project's other measurements and sampling results.
No. Allow temperature and conductivity readings to stabilize before recording them. Solinst's guidance calls for approximately 20 seconds per degree Celsius of temperature change when profiling. Follow the operating instructions for your meter and field procedure.
The 107 supports one- to four-point manual conductivity calibration using 1,413; 5,000; 12,880; and 80,000 µS/cm standards. Select calibration points appropriate to your expected field range and follow Solinst's calibration procedure.
The package includes the assembled meter with reel, TLC probe, selected tape configuration, a 9V battery, and a tape guide.
No. The carrying case and conductivity calibration solutions are sold separately.
Ways to Contact Us
Activated Carbon Depot
Email: sales@activatedcarbondepot.com
Phone: 949-229-2587
