Simplified logic in Messwert listing. No extra logic anymore to check if a "<" char is displayed in front of the measured value. Simply dislplay the value and value form messwertNwg.

/**
 * Store for Messwerte
 */
Ext.define('Lada.store.Messwerte', {
    extend: 'Ext.data.Store',
    model: 'Lada.model.Messwert'
});