Water Detection Unit and Measuring Tape Reel



  • Precision measurement, simplicity, and durability
  • Detect water levels and well bottoms with high precision
  • Trouble-free operation in wells with falling water and heavy oil slicks, even if well is not cased
  • Polycarbonate sturdy reel
  • Durable polyester powder-coated steel frame
  • Corrosion-resistant stainless steel fittings
  • Large, ergonomic brake and soft grip vinyl winding handle
  • Water and dust-proof encapsulated electronics
  • Strong and accurate NTS certified tape with stainless conductors
  • Full depth stainless steel and Teflon probe
  • Long lasting flexible link between the tape and probe
  • Tape marked in 1 foot and 0.01 foot intervals
  • Audio alert beeper and LED indicate contact with the water

Water Well Level Sounder Product Description

Global Water’s WL500 Well Level Sounder sets a new precision standard for well water level measurement. The Water Level Sounder meets or exceeds federal specification US GGG-T-106E (USA) or EEC CLASS II (Europe) for a guaranteed accuracy of 0.008%. The Water Level Sounder uses a full depth-rated stainless steel and teflon probe that is 5/8-inch (16 mm) in diameter. The water level sounder’s sensor electronics are encapsulated in a water and dust proof housing. The water level sounder’s electronics module can be removed so that the entire reel and tape can be cleaned and decontaminated. The flat spring steel core ensures that the level sounder will hang perfectly straight in large and small diameter wells. This provides unparalleled accuracy when compared to the flat white tapes, where kinks in the tape introduce slight errors, in addition to the displacement of water changing the static level.

The water level sounder uses a shrouded probe with a unique design to prevent bridging and detect the bottom of the well. Bridging is often encountered during pump tests with similar water level sounders. All WL500 Well Level Sounders carry a sensitivity adjustment for different water qualities. This sensitivity control prevents false readings in wells containing very pure water or very conductive water and is ideal for pump and draw down tests. When the water level sounder’s probe assembly makes contact with the surface of the water, a bright LED glows and a beeper sounds on the reel. The water level sounder detects the bottom of the well using a specially engineered tip that causes the sounder’s audio alarm to cease when the bottom of the well is reached.

The well level sounder consists of a strong NTS-certified polyethylene jacketed measuring tape that will accurately read to 0.01 foot or 1 mm. The tape reels are built of resistant polycarbonate (or, for units with over 400 ft cable, of lighter aluminum). Our clients almost universally prefer aluminum reels for the improved durability, ease of cranking, and better ergonomics. Most plastic reels have much smaller hubs and that makes cranking much tougher. All load bearing components on the WL500 well level sounders are made of aluminum.

The WL500, Water Level Sounder, has a rugged alumnium bearing.

The depth sounder is battery operated, thus there is no danger of shock from an outside power supply. Two conductors make a separate ground connection unnecessary, so the instrument will function equally well in uncased test holes or in uncased wells in rock. Water entering the well from casing leaks or perforations about the water level will not affect the depth gauge’s measurements.

Water Well Level Sounder Specifications

Tape Graduation: 1 ft and 0.01 ft intervals or 1m and 1mm intervals
Tape Material: Polyethylene
Probe Diameter: 5/8″ (16mm)
Signal: Audible buzzer and light
Battery: 9 V battery
Shipping Weight: 300 ft (100m) tape: 9 lbs (4 kg)
Shipping Size: 12×14.5×8.5 inches (31 x 37 x 22 cm)

Water Well Level Sounder Options

WL500 Water Well Level Sounder
(Specify tape length and unit type (standard or metric) upon order placement)

50 feet (PN# AHC000) or 15 meters (PN# AHK000)

100 feet (PN# AHB000) or 30 meters (PN# AHL000)

150 feet (PN# AHD000) or 50 meters (PN# AHM000)

200 feet (PN# AHE000) or 60 meters (PN# AHN000)

300 feet (PN# AHF000) or 100 meters (PN# AHO000)

400 feet (PN# AHG000) or 120 meters (PN# AHP000)

500 feet (PN# AHA000) or 150 meters (PN# AHQ000)

**Contact us for longer ranges.


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