Well it's good to hear others have this meter too. I must admit It's as good as new condition and I've just realised it's about 25 years old
My parents purchased it when I was a young lad hooked on electronics and even now with a lab full of equipment at work I'm still fond of this meter. It brings back memories walking around the UK version of Radio Shack (TANDY) and wondering what to save up for next.... Ah the memories.
I'm surprised so far no details of the SMC4301F0A I.C has turned up. The schematic is straight forward enough to see what to 'turn' to calibrate but I'm presuming some reference levels need to be set to complete the calibration.
Not looking too hopeful at the moment on calibration method which is unfortunate.
Thanks