Comparison : Item # 7400 EXP, Pennsylvania 7400 EXP NTEP Scale Weight Indicator
Item # 7400+, Pennsylvania 7400 Plus NTEP Scale Weight Indicator
Item # 7500 EXP, Pennsylvania 7500 EXP NTEP Scale Weight Indicator
Item # 7500+, Pennsylvania 7500 Plus NTEP Scale Weight Indicator
Item # 7600 EXP, Pennsylvania 7600 EXP NTEP Scale Weight Indicator