PE ruler cable for groundwater well depth measurement. Metric graduations printed on polyethylene jacket. Stainless steel tape or wire core. For borehole depth measurement, water level gauging, and well survey.
Water well ruler cables (also called well depth tapes or measuring cables) are used to measure the depth to water level in boreholes and water wells, and to determine total well depth during and after drilling. Unlike standard steel tapes, ruler cables integrate metric (or imperial) graduations into a PE-jacketed tape or round cable that is durable, corrosion-resistant, and suitable for repeated immersion in borehole water — including saline and slightly contaminated groundwater.
The polyethylene jacket protects the graduations from abrasion and chemical attack, and maintains legibility in wet conditions where printed paper tapes would become unreadable. A stainless steel tape or wire core provides the tensile strength to support the cable weight in deep boreholes without stretching — ensuring accurate depth readings at all measurement depths.
| Parameter | Value |
|---|---|
| Graduation System | Metric (mm/cm/m markings) |
| Core | Stainless steel tape or wire |
| Jacket | Polyethylene (PE) |
| Available Lengths | 50 – 300 m |
| Accuracy | ±1 mm / 10 m |
| Water Resistance | Fully submersible |
| Temperature | 0°C to +60°C |
Standard steel measuring tapes corrode rapidly when repeatedly lowered into groundwater — especially saline or slightly acidic water. Stainless steel core with PE jacket maintains accuracy and legibility across years of regular use.
Graduations on PE ruler cables are moulded or laser-engraved into the jacket surface — they cannot wash off, fade, or become illegible when wet, unlike printed paper tapes or paint markings on steel tapes.
