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Needle Sensors

Pierce your sample

All Unisense microsensors can be equipped with a steel needle, except the N2O microsensor. This modification is useful if you are measuring through a rubber septum, or in coarse or hard samples where a hole has been drilled prior to microsensor measurements.

The needle sensors are strong on the longitudinal axis, but due to the larger sensor tip diameter, Unisense does not recommend to use the sensors for microprofiling in sediment or biofilm.


The microsensor tip is inserted into a steel needle giving the sensor maximal strength on the longitudinal axis.

Options needle sensors

Dimensions Price Comments
1.60*40 mm Standard -NP version needle sensor for piercing
1.10*40 mm Standard -N version needle sensor
0.80*40 mm + 20% not pH electrodes
1.60*40 mm + 10% made as -N version
2.10*80 mm + 20% not available for all sensors - please inquire


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Profiles in salty crusts

Profiles in salty crusts

Unisense microsensors were succesfully applied to measure salty crusts in the Red Sea in Israel. 

Read more

Kristensen, Erik et al (2011), Contrasting effects of the polychaetes Marenzelleria viridis and Nereis diversicolor on benthic metabolism and solute transport in sandy coastal sediment, Marine Ecology Progress Series, 125 - 139, vol. 425 Read abstract

O'Connor, Ben L. et al (2008), Scaling hyporheic exchange and its influence on biogeochemical reactions in aquatic ecosystems, Water Resources Research, 1 - 17, vol. 44 Read abstract

Quintana, Cintia Organo et al (2011), Burrow ventilation and associated porewater irrigation by the polychaete Marenzelleria viridis, Journal of Experimental Marine Biology and Ecology, 179 - 187, vol. 397 Read abstract

See all publications