EL500 Paired (Dual) Electrodes (Pkg. 25 pairs) EL501 Small Stress Test Electrodes (Pkg. 50) EL502 Long-term Recording Electrodes (Pkg. 50) EL502-10 Long-term Recording Electrodes (Pkg. 500) EL503 General-purpose Electrodes for ECG, EEG, EMG, EOG (Pkg. 100) EL503-10 General-purpose ECG, EEG, EMG, EOG, Electrodes (Pkg. 1000) EL504 Cloth Base EMG Electrodes 2.5cm sq. - EMG (Pkg. 30) EL504-10 Cloth Base Electrodes 2.5cm sq. - EMG (Pkg. 300) EL506 Strip Electrode - Bioimpedance (Pkg. 8) EL506-10 Strip Electrode - Bioimpedance (Pkg. 80) EL507 EDA (Isotonic Gel) Snap Electrodes (Pkg. 100) EL507-10 EDA (Isotonic Gel) Snap Electrodes (Pkg. 1000) EL508 Electrode, Radiotranslucent (Pkg. 100) Band Electrodes Same Day Shipping Orders with UPS Red or Blue shipping will be shipped on the same day (based on available stock) if received by 2 p.m. PT (Monday-Friday).