pH meter, 1950-1970.

Exton, David

 
pH meter, 1950-1970.
4 0 c m
 
34cm
actual image size: 26cm x 32cm

Description

Direct reading pH meter, model 23A, made by Electronic Instruments Ltd of Richmond, Surrey, UK. In chemistry the pH value of something (for example rainfall) refers to its acidity or alkalinity, whereby a pH value of 7 is neutral, values lower than 7 are more acid and higher than 7 more alkaline.

Image Details

Artist
 
Image Ref.
 
10439358

© Science Museum / Science & Society Picture Library

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