Radio Shack hasn't sold the analog SP meter for a while, here is the one they currently have in their catalog :

Current Radio Shack SPL meter

I don't know if this is compatible with the Meridian room correction functionality or not. I don't own the new model, but you are free to borrow mine and my microphone stand if you live nearby :-). Mine says on the back : RadioShack Sound Level Meter Cat. No. 33-2055 A.

Radio Shack has been "dumbed down" and primarily sells cellular phone plans and high priced HDMI cables now . Most people don't own soldering guns anymore or repair their own TV sets or Onkyo stereos (yuck yuck). (More's the pity I think is the British saying).

Primary: 818v3+ID41, M6 stereo pair, M SpeakerLink cabling, Sonos+96kHz Cullen, silver DSW
HT: Marantz prepro, 271, DSP3300, 8K SE FL/FR pair, DSP M6x2, DSP320x4 (ceiling), black DSW, 520 RL/RR rear in-walls
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Vac. Home: G61, HD621, 4xDSP3100, DSP3100HC
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