What is a Deep Well Water Level Meter?
A deep well water level meter (also called borehole dip meter or steel ruler water level meter) measures the depth from the ground surface down to the water level inside a well, borehole or drill hole. The GLT500A works on a simple, field-proven principle: a stainless steel probe is lowered into the well on a steel ruler cable; the moment the probe tip touches the water surface, the conductive circuit closes and the instrument triggers an instant buzzer sound and LED light. You then read the water depth directly from the permanent scale printed on the cable.
The probe is the only sensing element — no pump, no power wiring, no fragile electronics at depth. With a range up to 500 meters, millimeter-level accuracy of ±0.5 mm and a slim 14 mm probe for narrow boreholes, the GLT500A is built for hydrological surveys, water conservancy projects, irrigation districts and groundwater monitoring where reliable field readings matter.
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | GLT500A Water Level Meter |
| Measurement range | 30 m / 50 m / 100 m / 200 m / 300 m / 400 m / 500 m |
| Measurement error | ≤ ±0.5 mm |
| Response time | ≤ 1 ms |
| Probe material / diameter | Stainless steel, 14 mm (IP68, water-pressure sealed) |
| Signal indication | Buzzer + LED (selectable via DIP switch) |
| Battery power | 9 V lithium battery, up to 2 years under normal use |
| Adaptation range of water quality | 10 μω – 1000 μω conductivity |
| Instrument operating temperature | -20 ℃ to +60 ℃ |
| Cable temperature range | -40 ℃ to +90 ℃ |
| Cable construction | Multi-strand tinned copper conductors, PP mixed insulation, PUR/PE outer sheath; steel ruler with permanent scale |
| Shell material / color | ABS + metal; blue / yellow / black |
| Rated voltage / testing voltage | 300 V / 2000 V |
| Insulation resistance | > 200 MΩ × km |
| Flame retardant | IEC 60332-1 |
| Electrode protection | Patented polarization-resistance excitation circuit, anti-corrosion electrode |
How to Measure Deep Well Water Level in 4 Steps
Loosen the screws at the back of the wire spool to allow free rotation, then press the power button — the indicator light comes on.
Guide the probe into the well casing and lower it slowly while holding the steel ruler cable.
The moment the probe contacts the water surface, the buzzer sounds continuously and the LED lights up. In noisy sites, switch to the voltmeter peak indication.
Read the depth marking on the steel ruler cable at the top of the pipe. Convert the reading to elevation as required.
Accuracy tip: identify the exact start of the buzzer/indication and move the probe slowly — reading accuracy depends on operator familiarity, so practice on each new site.
Which Measurement Range Do You Need?
| Well / borehole condition | Recommended range | Typical users |
|---|---|---|
| Shallow wells, irrigation channels | 30 m / 50 m | Rural irrigation, water conservancy projects |
| Production wells, monitoring wells | 100 m / 200 m | Hydrogeology, groundwater monitoring |
| Deep boreholes, dam piezometers | 300 m / 400 m | Geotechnical surveys, engineering safety |
| Ultra-deep wells, mining boreholes | 500 m | Mining, deep groundwater exploration |
Not sure? Measure the planned installation depth with margin, then contact our team — custom cable lengths and ranges are available on request.
Applications
Direct groundwater level measurement in cased wells and narrow boreholes down to 500 m.
Piezometric level checks on reservoir dams, embankments and power stations for engineering safety.
Field surveys and monitoring-well networks for groundwater studies and environmental protection.
Water level verification for irrigation wells and channels — battery-powered, ready anywhere.
Water level recording for environmental engineering and polluted-site investigation.
Quick on-site verification of newly drilled wells and pumps — no installation, no power supply needed.
Manual Meter or Wireless Transmitter — Which Fits Your Project?
| Comparison | GLT500A Manual Steel Ruler Meter | Wireless Level Transmitter (4G / NB-IoT) |
|---|---|---|
| Measurement mode | Manual lowering, read on the spot | Automatic, continuous remote upload |
| Power supply | 9 V battery, 2-year life | External power / solar panel |
| Cost structure | One-time low investment, no running cost | Device + data plan + platform fee |
| Best for | Periodic inspection, acceptance testing, portable field surveys | 24/7 online monitoring, alarm systems, multiple sites |
Frequently Asked Questions
What are the main applications of this water level meter?
Hydraulic engineering, hydrogeology, environmental monitoring, rural irrigation areas, reservoir dams, river embankments, power stations, groundwater level and well water level measurement.
What is the maximum measurement depth available?
Depending on the model, depths range from 30m, 50m, 100m, 200m, 300m, 400m, to 500m.
How does the instrument indicate water contact?
When the probe tip touches water, the built-in buzzer emits a continuous sound and the LED on the panel turns on — both audible and visual feedback.
What is the measurement accuracy?
Probe detection error is ≤ ±0.5 mm, suitable for water conductivity from 10 μm to 1000 μm.
How long does the battery last?
A single 9V lithium battery lasts up to two years under normal use thanks to the low-power circuit design.
Can it operate in extreme temperatures?
Yes. Operating temperature is -20 ℃ to +60 ℃, and the cable withstands -40 ℃ to +90 ℃.
How deep can the GLT500A measure?
Up to 500 meters. Choose 30/50/100/200/300/400/500m range according to your well or borehole depth; custom lengths are available.
Can it measure in narrow boreholes?
Yes. The slim 14mm stainless steel probe fits narrow boreholes and casing wells, fully sealed to IP68 for high-pressure deep-well conditions.
Manual meter or wireless transmitter — which fits my project?
Manual steel ruler meters suit portable, low-cost periodic inspection and acceptance testing. Wireless transmitters (4G/NB-IoT) suit 24/7 remote continuous monitoring. Contact our team for a tailored recommendation.
How do I read the water level data?
Once the probe contacts water and triggers the signal, read the depth marking on the steel tape cable at the top of the pipe, then convert the reading to elevation.
Any tips for first-time users?
Practice repeatedly to identify the exact moment the buzzer or light activates, and always raise and lower the cable slowly for precise readings.
About GAMICOS
GAMICOS is a high-tech manufacturer of liquid level and pressure measurement instruments, integrating R&D, production and sales. Product lines cover pressure sensors, liquid level sensors, fuel level sensors, water level meters, ultrasonic level meters, radar level meters and Lora/GPRS/NB-IoT/4G wireless instruments. Exported to 100+ countries and regions, serving thousands of customers every year with full OEM/ODM support.
