AND Apollo GX303A [GX-303A] Multi-Functional Precision Balance w/Internal Calibration, 320g x 0.001g - 128mm × 128mm. The A&D Weighing Apollo GX-303A Precision Balance, 320 x 0.001g features a super hybrid design, construction, and algorithms. The GX303A offers password protection for up to 11 users and 1 administrator. The GX303A's stainless steel pan and dust plate can be easily removed for cleaning. The GX303A is easy to assemble anti-static breeze break on 0.001 readability models.