# \*\*BrainMaster Discovery 20 EEG/QEEG System with Impedance Lid, Z-Scores & 2 Greentek Caps\*\*

**URL:** <https://neurobb.com/t/brainmaster-discovery-20-eeg-qeeg-system-with-impedance-lid-z-scores-2-greentek-caps/2854>\
**Category:** Hardware\
**Created:** [October 6, 2026, 1:39pm UTC](https://neurobb.com/t/brainmaster-discovery-20-eeg-qeeg-system-with-impedance-lid-z-scores-2-greentek-caps/2854 "2026-10-06T13:39:39Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![sara.mccullough78](https://neurobb.com/letter_avatar_proxy/v4/letter/s/cab0a1/32.png) [@sara.mccullough78](https://neurobb.com/u/sara.mccullough78)\
**Post date:** [October 6, 2026, 1:39pm UTC](https://neurobb.com/t/brainmaster-discovery-20-eeg-qeeg-system-with-impedance-lid-z-scores-2-greentek-caps/2854/1 "2026-10-06T13:39:39Z")

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**BrainMaster Discovery 20 EEG/QEEG System with Impedance Lid, Z-Scores & 2 Greentek Caps**

**Asking Price: $6,500 OBO**

Email: [Sara.McCullough78@gmail.com](mailto:Sara.McCullough78@gmail.com)

BrainMaster Discovery 20 professional 20-channel EEG/QEEG amplifier in good working condition. Complete setup suitable for EEG acquisition, QEEG, Z-score neurofeedback, and neurofeedback applications.

**Included with sale:**

- BrainMaster Discovery 20 20-channel EEG amplifier
- Impedance-sensing lid for electrode impedance monitoring
- Original BrainMaster passkey
- 19-channel Z-Score capability
- BrainAvatar/Discovery acquisition capability
- QEEG capability
- Carrying case
- USB connection/cable
- 7 EEG leads
- 4 ear clips
- Greentek Gelfree-S3 Medium EEG cap
- Greentek Gelfree-S3 Large EEG cap
- All accessories included with both Greentek cap kits

**Greentek Gelfree-S3 EEG Caps**

Includes **two BrainMaster-compatible Greentek Gelfree-S3 semi-dry/saline EEG electrode caps** :

**Medium:** BM-JAS3-2024  
**Large:** BM-JAS3-1024

**Both caps have only been used twice each** and include all accessories. The Gelfree-S3 system provides an alternative to traditional gel-based EEG caps and is designed for repeated EEG recordings using standard electrode positioning.

**Price: $6,500 OBO**

This is a comprehensive EEG/neurofeedback package that includes the impedance lid, 19-channel Z-score capability, original passkey, QEEG capability, EEG accessories, carrying case, and **two very lightly used Greentek Gelfree-S3 caps with all accessories**.

Buyer should verify any BrainMaster software/license transfer or re-registration requirements and associated fees directly with BrainMaster

 ![IMG_6632](https://neurobb.com/uploads/default/original/1X/198591395147632a03bdbabac73f5c1a1545b5a9.jpeg)  
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