Complete, functional, professionally cleaned inside out. Has its original manufacturer's tags, power cord, waste, buffer and solution bottles. This is model 2700TX-D signed YSI Yellow Springs Instrument Ohio. Serial number 91A022819. Its digital screen display, buttons and functions work well. Minor surface scuffs, no broken parts. Configured as a single or dual channel unit. As a single channel, it provides quick measurements of any of the following analytes: D-Glucose (Dextrose), Sucrose, Ethanol, Lactose, L-Lactate, L-Glutamate, Choline, L-Glutamine, Methanol, Galactose 1, Hydrogen Peroxide and Wylose 2. As a dual channel, it provides simultaneous measurements of the following combined analytes: Dextrose and L-Lactage, Dextrose and Sucrose, L-Glutamate and L-Glutamine 1. The default parameter of several functions can be adapted to your needs. Aspirated sample size can be set from 5 to 65 microliters.