Comparison : Item # 91995, 820i Universal, Single Channel 115 VAC†
Item # 91996, 820i Universal, Single Channel 230 VAC†
Item # 91997, 820i Universal, Single Channel 230 VAC†† CE/OIML
Item # 107711, 820i Universal, Single Channel 9-36VDC Nominal
Item # 93424, 820i Panel Mount, 115VAC†