T51P: ABS plastic housing with reversible rear cover for either wall, column, scale front or table top mounting. High visibility 6 digit, 7 segment LCD display. 3 color LED checkweigh indicator. Fast display stable weight within 2 seconds. 4 key membrane raised tactile keys. One key, multiple mode selection. Internal slot for capacity label. Included table/wall mount bracket. Built in RS232 bi-directional interface and built in external input, optional RS422/485, optional second RS232 and optional AC or DC relay. Simple plug in battery installation. (6) 'C' Alkaline batteries or optional NiMH battery. Universal switching power supply automatically adapts to different voltages from 100-240 VAC.T51XW: Stainless steel. Bright white 6 digit, 7 segment LED backlit. 3 color LED checkweigh indicator. Fast display stable weight within 2 seconds. 4 key membrane raised tactile keys. One key, multiple mode selection. Internal slot for capacity label. Included table/wall mount bracket. Built in RS232 bi-directional interface and built in external input, optional RS422/485, optional second RS32 and optional AC or DC relay. optional NiMH battery. OP66/NEMA4X enclosure. Universal switching power supply automatically adapts to different voltages from 100-240 VAC.