AD 56448677 36V Battery Condition Meter for Nilfisk Advance Floor Cleaning Equipment. A console mounted round display that shows the floor equipment battery condition. Marked "Recharge, Work Range, and Charge Range. A 36V gauge. Fits Nilfisk Advance floor equipment including Hydro-Retriever Models including 320BHD, 380BHD, 500B, 5010B (battery models with serial number above 372789), and HydroCat 5015 (5015 battery models with serial number above 488414). Also fits Whirlamatic UHSB 17, UHSB 20, Whirlamatic UHSBD20, Whirlamatic 2000B-W, Whirlamatic Twin 2000, Select Gloss 20B, and Aquamatic 26BF. Fits older Advance Convertamatic 32B, 32BD, 38BD and Hydro-Retriever 320BHD and 380BHD walk behind scrubbers with serial numbers above 323354. Please check your serial number before ordering. One battery meter required per unit. Priced Each. Replaces Nilfisk Advance 56448677. Our Part Number 56448677