AND Newton EJ [EJ-54D2] Portable Precision Balance with External Calibration, 22/52 g x 0.0002/0.001 g - 50mm. The A n D Weighing EJ-54D2 EJ Portable Balance 22/52g x 0.0002/0.001g is affordable that offers flexible and practical performance. The EJ54D2 smartly optimizes counting accuracy with "ACAI" that auto improves accuracy throughout your counting procedure. The EJ54D2 external calibration switch and gravity acceleration correction keeps you accurate and precise.