customized economical 16mm hach cod vials with pp cap-glass hach model 16500 cod reactor. this unit is in good physical condition and shows signs of use. it power ups. heats up to max temp of 150 degrees celcius as shown in pics, it holds at a constant temperature at max temp, and all lights on front of unit work. this unit is designed to hold 16(4 x 4) 15 x 100mm borsilicate screw cap culture vials.