CS610-L 3-Rod TDR Probe with RG8 Cable
Typical Soils
Up to 25 m cable length
weather applications water applications energy applications gas flux and turbulence applications infrastructure applications soil applications


The CS610 is used in TDR100- and TDR200-based systems, and it is recommended for typical soils (soil bulk conductivity ≤1.5 dS/m). Its RG8 cable allows the CS610 to have cable lengths longer than 15 m. The maximum distance allowed between the reflectometer and probe tip is 25 m as measured from the tips of the probe's rods to the reflectometer. This probe consists of three pointed, large-diameter rods and a large epoxy head allowing installation in rugged environments.

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Detailed Description

The CS610 acts as a wave guide. Impedance along the rods varies with the dielectric permittivity of the surrounding soil. Because the dielectric permittivity of soil primarily depends on the amount of water present, soil volumetric water content can be inferred from the reflected measurements. Soil bulk electrical conductivity is determined from the attenuation of the applied pulse.

Campbell Scientific offers six TDR probes for our TDR100- and TDR200-based systems. The probes have different rods and connector cables allowing them to be used in different soil types and with different cable lengths. Other TDR probes offered by Campbell Scientific inclde the CS605, CS630, CS635, CS640, and CS645.


Maximum Soil Bulk Electrical Conductivity ≤ 1.4 dS/m
Spacing between Outer Rods 4.5 cm (1.77 in.)
Rod Diameter 0.48 cm (0.187 in.)
Rod Length 30 cm (12 in.)
Epoxy Head Dimensions 7 x 10.8 x 1.9 cm (2.8 x 4.3 x 0.7 in.)
Weight 363 g (13 oz) without cable
Cable Weight 272 g (10 oz) per 3.1 m (10 ft) of cable


Note: The following shows notable compatibility information. It is not a comprehensive list of all compatible or incompatible products.

Measurement and Control

Product Compatible Note
SDMX50 (retired)
SDMX50LP (retired)
SDMX50SP (retired)
TDR100 (retired)

Frequently Asked Questions

Number of FAQs related to CS610-L: 1

  1. In applications where TDR probes are used to measure soil water content, the maximum distance from the TDR probe back to the TDR100/TDR200 (even through one or more multiplexers) cannot exceed 15 m (50 ft) when using RG58 coaxial cable; the CS605-L, CS630-L, and CS640-L TDR probes have an RG58 cable. When using low-loss coaxial cable, the distance cannot exceed ≈25 m (80 ft); the CS610-L, CS635-L, and CS645-L TDR probes have a low-loss coaxial cable.

    In slope stability and rock mass deformation applications, the maximum coaxial cable length should not exceed ≈1 mile (5,280 ft). The maximum combined length of all SDM cables in the system should not exceed ≈76 m (250 ft).

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Other Accessory for the following products:
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