Solinst® Laser Marked Water Level Meter Model 102

Coaxial Cable Water Level Meter

The Solinst Model 102 Water Level Meter is designed to measure groundwater levels, especially in small diameter tubes and piezometers or where a flexible cable is needed to snake past an in-well pump. Also available from Solinst, is the Model 101 Water Level Meter which features an easy-to-read, easily repaired flat tape. (See Model 101 Data Sheet).

Operating Principles

The Model 102 Water Level Meter uses a choice of two small diameter probe designs, attached to a narrow coaxial cable, fitted on a sturdy ergonomically designed reel. A standard 9 volt battery, housed in an easy-access battery drawer, powers the Water Level Meter.

When the probe enters water the electrical circuit is completed, sending a signal back to the reel where a light and clearly audible buzzer are activated. The water level is then determined by taking a reading directly from the cable at the top of the well casing or borehole.

A sensitivity control allows the buzzer to be scaled back or turned off while in cascading water, and ensures a clear signal in both high and low conductivity conditions.


Model 102 Probes are designed with segmented weights for flexibility. The probe tip uses a recessed design to minimize false signals in cascading water.


  • 1/4" dia. x 1.5" long (6.4 mm x 38 mm) stainless steel with 12 weights, weighing 2.5 oz (70 g). It is ideal for accessing narrow diameters.


  • 3/8" dia. x 1.5" long (10 mm x 38 mm) brass with 10 weights, weighing 4.6 oz (130 g). The heavier probe is ideal for greater depths.

Laser Marked Cable

The coaxial cable has a heavy-duty jacket with permanent markings precisely laser etched on the cable every 1/100 ft. or each millimeter.

The cable reels smoothly, remains flexible, and hangs straight in the well. It comes in lengths from 100 ft. - 1000 ft. (30 m - 300 m).

A braided copper outer conductor gives flexibility and a stranded stainless steel central conductor gives strength. It is easy to repair and splice. The cable jacket is of heavy-duty polyethylene for durability.

102M Mini Laser Marked Water Level Meter

The laser marked coaxial cable is mounted on a convenient small reel that is light-weight and fits easily into a mini carrying case or backpack. The accurate cable is marked each 1/100 ft. or each millimeter.

The 102M Mini Water Level Meter is available in 80 ft. and 25 m lengths. There is the choice of the P1 or P2 Probe with segmented weights.

Close block


    Low Cost

  • Solinst quality at a low price


  • 1/4" (6 mm) dia. probe

    Long Life

  • Rugged, corrosion proof components
  • Strong, flexible cable is easily spliced
  • Replacement probes, cables and parts


  • Precise markings every 1/100 ft. or mm
  • Traceable to national standards

Solinst Laser Marked WLM Model 102

Solinst 102M Mini Laser Marked WLM