Specmaster correctly identified this
![](https://www.eevblog.com/forum/testgear/test-equipment-anonymous-(tea)-group-therapy-thread/?action=dlattach;attach=508184;image)
as a Gould Gamma True RMS Multimeter, here with its clothes on:
![](https://www.eevblog.com/forum/testgear/test-equipment-anonymous-(tea)-group-therapy-thread/?action=dlattach;attach=508787;image)
I bought it about a year ago off the 'bay for a song - I don't think I spent a tenner, and it certainly wasn't over £15. The original intention was to gut it and reuse the rather fine aluminium case and tilting bail. It was sold 'spares and repairs' untested and with the dodgy looking LCD I suspected that it was a deader. In fact it's working, agrees within 1 count or two with my other 3
1/
2 digit meters; so as such I haven't yet had the heart to re-purpose it as originally intended. The LCD is rather 'orrible and if I'm going to keep it in working condition I'll have to track down a compatible display and install that.
For the afficianardos, the "True RMS" element is a ceramic, gold plated AD536JD and the voltage reference is a very ordinary looking BZX79C zener, which I expect was selected and carefully burned in given its otherwise pedestrian specification.
Here is the full set of pics, shot rather hastily this afternoon to compensate for all my wibbling about JPEG sizes and to "keep it TEA".
![](https://www.eevblog.com/forum/testgear/test-equipment-anonymous-(tea)-group-therapy-thread/?action=dlattach;attach=508793;image)
![](https://www.eevblog.com/forum/testgear/test-equipment-anonymous-(tea)-group-therapy-thread/?action=dlattach;attach=508799;image)
Note the dual power. I've never tried it on batteries as I don't keep C/SP11/HP11 cells around the house.
![](https://www.eevblog.com/forum/testgear/test-equipment-anonymous-(tea)-group-therapy-thread/?action=dlattach;attach=508805;image)
![](https://www.eevblog.com/forum/testgear/test-equipment-anonymous-(tea)-group-therapy-thread/?action=dlattach;attach=508811;image)
![](https://www.eevblog.com/forum/testgear/test-equipment-anonymous-(tea)-group-therapy-thread/?action=dlattach;attach=508817;image)
![](https://www.eevblog.com/forum/testgear/test-equipment-anonymous-(tea)-group-therapy-thread/?action=dlattach;attach=508823;image)