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That high reading is probably what's called a "surface charge", which can show on a freshly charged battery before it's had any demands made on it. (Especially if your Alternator is putting out 15 volts)
When the battery is put into use (or over a short time), this surface charge dissipates, and the battery level drops back to its nominal 12 volts. This initial drop is normal.
So I wouldn't necessarily blame your meter.
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Bruce Young, '93 940-NA (current) '80 GLE V8 (Sold 5/03) '83 Turbo 245 '76 244 (lasted only 255,000 miles) 73 142 (98K) '71 144 (track modified--crusher bound) New 144 from '67 to '78 Used '62 122 from '63 to '67
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