AND Newton EJ [EJ-200] Portable Precision Balance with External Calibration, 210g x 0.01g - 110mm. The AND Weighing EJ-200 Newton EJ Portable Balance 210g x 0.01g is affordable that offers flexible and practical performance. The EJ200 smartly optimizes counting accuracy with "ACAI" that auto improves accuracy throughout your counting procedure. The EJ200 external calibration switch and gravity acceleration correction keeps you accurate and precise.