Seca Cardiotest 6900 electrocardiograph, serial no. 00254, with LCD screen, keyboard, electrodes and paper printout facility, with Seca Cardiotest 7500, serial no. 37901016, blood pressure testing unit and pressure cuff, supplied by Seca Ltd, UK. Produced for Seca Vogel & Halke, Hamburg, Germany, 1994. Seca Cardiotest 6900 electrocardiograph 1994