Solinst Model 122 Oil Water Interface Meter

  • Next Day Delivery Available* *Available next day - mainland UK if paperwork is received by 12 midday (stock permitting)
  • Rugged with laser marked flat PVDF tape to 300m Replaceable probe design. Accurate to 1mm.
  • Ideal for LNAPL, DNAPL & Hydrocarbon Detection
  • Mini Interface Meter available (122M)
  • ATEX Certified
Product Options
Carry Case Required


Reliable and accurate measurements of the
oil/water level

The Solinst Model 122 Interface Meter is easy to use and gives accurate, reliable measurements of product level and thickness in tanks and wells. A steady tone and light indicate dense non-aqueous phase liquids (DNAPL) or light non-aqueous phase liquids (LNAPL) whilst an intermittent signal indicates water. The Solinst flat tape is available in lengths up to 300m or 1000 ft. The factory sealed probe on this interface meter is pressure proof and is designed for use in various monitoring applications.

The Solinst 122 Interface Meter holds up to 300m or 1000ft of narrow flat tape on a reel. It benefits from a long battery life, giving 120 hours or more of normal use with only one standard 9V battery. The 122 Interface Meter is also available as a Mini Interface Meter

New and Improved Version

The latest version of the 122 interface meter is most importantly now ATEX certified. It is also boasts a brand new probe (P8 probe) which has superior accuracy of 1.00m with a diameter of just 16mm and can withstand pressure up to 500psi.

The new electronics now offer over 120 hours continuous operation with just one 9 volt battery.

The new 122 also benefits from a Laser Marked PVDF tape which makes it almost impossible to remove the markings. This new tape is non-stretch, can remain rigid and can hold upto 100kg in weight.

Each full size interface meter is supplied with a grounding cable, a cleaning brush and a tape guide. An optional carry case is available to purchase separately.

Manufactured by: Solinst
Model: Solinst Model 122 Oil Water Interface Meter

Services offered for this product

  • Sales
  • Rental
  • Installation
  • Calibration
  • Maintenance


Identifying oil/product
Wastewater management/landfill
Well monitoring


122 P8 5/8” diameter (16 mm) stainless steel. The beam is emitted from within a Hydex cone-shaped tip. It is pressure proof up to 500 psi. The tip is protected by an integral stainless steel shield. This probe is excellent for the vast majority of product monitoring situations.
122M Probe 5/8” diameter (16 mm) stainless steel. Similar to the P8 but shorter.
Tape The easy-to-read markings on the tape are permanently laser marker into the tape. The dog bone shaped tape avoids adherence to wet surfaces in wells. It is resistant to most chemicals, and the smooth surface of the tape is easy to decontaminate, and easy to handle.
LM2 Feet and tenths: with markings every 1/100ft.
LM3 Meters and centimetres: with markings every mm.
N2 and N3

As above, but on the narrow 1/4” (6 mm) tape for the 122 Mini Interface Meter.


Related products


The Model 122 will detect all types of DNAPL and LNAPL layers as long as both are pure/non-conductive, it will only face an issue if the base of the well is very thick and sticks to the probe which would mask it but you will still get a reading slowly lowering the probe into the DNAPL. You can read the manual HERE
The Solinst Model 122 has an accuracy of 1.0mm. You can read the manual HERE