# FS: Venkman ESP Shock Machine - REAL WOOD - Beckman pH Meter & Zener Cards

**URL:** <https://forum.gbfans.com/t/fs-venkman-esp-shock-machine-real-wood-beckman-ph-meter-zener-cards/219454>\
**Category:** Classifieds\
**Created:** [October 13, 2026, 1:03am UTC](https://forum.gbfans.com/t/fs-venkman-esp-shock-machine-real-wood-beckman-ph-meter-zener-cards/219454 "2026-10-13T01:03:59Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![cworthdynamics](https://forum.gbfans.com/user_avatar/forum.gbfans.com/cworthdynamics/32/187470_2.png) [@cworthdynamics](https://forum.gbfans.com/u/cworthdynamics)\
**Post date:** [October 13, 2026, 1:03am UTC](https://forum.gbfans.com/t/fs-venkman-esp-shock-machine-real-wood-beckman-ph-meter-zener-cards/219454/1 "2026-10-13T01:03:59Z")

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Sean Charlesworth  
Crockett, CA  
$325  
Estimated shipping is around $20-30 via UPS - will be well-packed, insured and you will be charged actual shipping only.

I have a separate listing for a later, FAUX WOOD version with no lid.

I have a Beckman pH meter - the Venkman ESP shock machine - for sale. The GB1 version with a round gauge is hard to find - later versions with a square gauge are typically what you get. This was a square meter version which I have fitted with an appropriate round gauge.

- 3 electrode leads attached on inside and come out front door - they have been slightly weathered
- Fitted with an appropriate round gauge to match GB1
- Set of 5 custom oversized Zenner cards - they no longer make the large ones and they are hard to find. These are actual Bicycle playing cards that I have fitted with custom symbol labels. Labels are opaque and card face does not show through
- Case is in decent shape, worn from use. Unit is typically displayed without the lid.
- Unit is NON FUNCTIONAL - there is very little left inside and the wires have been cut.

 ![Non-functional. Fitted with leads and pads.](https://discdn.gbfans.com/original/3X/a/1/a1d65df82410502990ca68743adedbd93f9c41cb.jpeg)

 ![Original square meter has been replaced with movie-accurate round meter.](https://discdn.gbfans.com/original/3X/e/b/eb7b271b8a62e81e16701a21314e077f87310d4e.jpeg)

 ![Good, used condition](https://discdn.gbfans.com/original/3X/4/0/406c90724168d581db3a18d83ae3246555fc1c57.jpeg)

 ![Leads are threading inside](https://discdn.gbfans.com/original/3X/c/b/cb0667a873bf7c0b4d84904f9f9fae2989e37d8b.jpeg)

 ![Custom jumbo Zener cards](https://discdn.gbfans.com/original/3X/8/0/80eacd5c0ecd25b2d815f098aa25c7ffa48c18c3.jpeg)

 ![Actual Bicycle cards that have been modified with custom face labels](https://discdn.gbfans.com/original/3X/6/8/687dbc3fda214b33c653bf6217ac8d0f5f59b1e6.jpeg)