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Beckman 390 pH Meter with Electrodes and Holder - Research Quality | #1803322225
TRU Chemistry Labs: How to calibrate a Beckman pH meter (two point calibration) - YouTube
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pH Meter | National Museum of American History
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Shot in the dark but does anyone know how to calibrate this phi 40 Beckman pH meter? I can't find the manual anywhere as its decently old and meddling with it hasn't
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