Digital salt-meter ES-421 The digital salt-meter, ES-421 employs a funnel-shaped sensor section ( conductivity ), which measures the salt % of a sample ( dilute solution of soy sauce, ketchup,mayonnaise, Worcester sauce, sqeezed juice of pickles, etc. ) very small sample needed ( 1.0ml approx. is enough for measurement ). Model ES-421 Cat.No. 4210 Measurement Method Conductivity method Measurement Range 0.00 to 10.0% ( 100g ) of salt concentration Minimum Indication 0.01% for salt concentration of 0.00 to 2.99% 0.1% for salt concentration of 3.0 to 10.0% Measurement Accuracy Displayed value ± 0.05% ( for salt concentration of 0.00 to 1.00% ) Relative precision ± less than 5% ( for salt concentration of 1.00 to10.0% ) Temperature Compensation 10 to 40°C (Automatic Temperature Compensation) Ambient Temperature 10 to 40°C Power Supply 006P Dry battery (9V) Optional • 2.84% NaCl Solution AB284 : RE-120284 * Calibration Certificate : Contact an ATAGO representative for details. Dimensions & Weight 17×9×4cm, 300g (Main Unit only)