Model SR-2 Soil Resistance Meter by Tinker & Rasor

Accurate and Easy-to-Use with 4-pin Wenner or 3-pin Fall Potential Methods
The Tinker & Rasor SR-2 Soil Resistivity Meter is a highly accurate and easy-to-use soil resistivity instrument for use with the 2-pin and 4-pin (Wenner) methods of soil resistance measurement. A pin selector switch allows choosing between 2-pin and 4-pin tests without removing cables.

The SR-2 provides easy resistance readings with a digital 4-1/2 digit display, push-button operation, and an easily adjusted Ohm to MOhm range selector. The display will show in the correct range. Multiply reading with pin spacing multiplier for Ohm-cm.

Use the SR-2 to find soil resistivity for a variety of cathodic protections applications, including pipelines, tanks, wells, etc. Also use for geological and archeological studies.

Model SB-1 Soil Box

Use the SR-2 in the field or lab with the optional Tinker & Rasor Model SB-1 Soilbox, which has an easy to figure form factor 10. Model SB-1 is made of strong plastic resins, allowing for rugged field use. The wall material is clear for easy visual inspection and cleaning.

  • 4.5-digit display.
  • 0.01 Ohm to 3.3 MOhm ranges.
  • Simple push-button operation.
  • Weather / impact resistant Pelican case
  • Internal rechargeable 12V battery.
  • Low battery indicator.
  • AC adapter.
  • Quick Instructions in lid of instrument.
  • Up to 50-foot pin separations
  • 4-Pin "Wenner" method"
  • 3-Pin "Fall of Potential" method
  • 2-Pin method
  • 1-Pin "Single Rod" method
  • Data logger connection
    (DL-1 data logger sold separately)
  • Tinker & Rasor SB-1 Soil Box (sold separately).


  • Resistivity Ranges:  0.01 Ohm to 3.3 MOhm.
  • Accuracy:  ±10%.
  • Operating Temperature:  0-50ºC (32-122ºF).
  • Case:  Pelican® long-life case with weather-sealed lid.
  • Dimensions:  10.75" x 10.75" x 6.5" (273 x 273 x 165 mm)
  • Operating Weight:  6 lbs.
  • Shipping Weight:  7 lbs.