The Volume Reducer helps conserve gas (nitrogen) while in the field and will allow more measurements per tank. The 1/2 height volume reducer is good for samples that are short and bushy and only take up the upper part of the chamber such as a grape leaf. The Full Height Volume Reducer was designed to be hollowed out by the user to whatever diameter needed. It is made of PVC Plastic and the center can be drilled out to fit long slender samples such as a pine needles or conifer samples.
A Volume Reducer is not available for Model 670 Pressure Chamber