Use EL450 series needle electrodes for stimulation or recording in animal subjects and tissue preparations. These 28-gauge stainless steel needle electrodes are equipped with a flexible lead terminating in standard Touchproof connectors. Use one EL451 electrode, plus one EL452 ground electrode, when recording from a single site (e.g. studies of individual muscle fibers). Use a pair of EL450 or EL452 electrodes, plus one EL452 ground electrode, for general-purpose recording (e.g. ECG). For stimulation, use a pair of EL450 or EL452 electrodes. Teflon® coated needle electrodes are fully insulated, with a clear Teflon® overcoat, except for the conductive needle tip. Needle electrodes are shipped non-sterile, so pre-sterilization is required. EL451 Specifications Electrode Type: Concentric Bipolar Needle Teflon® coated Needle Dimensions: 460 µm (dia) x 3.0 cm (long) Leadwire Dimensions: 1.2 mm (dia) x 91 cm (long) One CBL201 cable is required to convert Safelead electrode connectors to 2 mm pin-style connectors. NOTE: To trigger an MRI System with the occurrence of the R-wave present in animal (high-frequency) ECG data being recorded on an ECG100C amplifier directing its output to the MP System, use the DTU100 Digital Trigger Unit. EL451 Needle Electrode, Concentric Bipolar (Coated) EL451$35.00 Same Day Shipping - orders with UPS Red or Blue shipping will be shipped the same day if received by 3 p.m. PT (Monday-Friday).