Anderson Instrument Co. AJ-300 Series Chart Recorders. Model: 31100010002100. Operating temperature range: 32°F→131°F. Storage temperature range: - 40°F→149°F. Enclosure: NEMA 4X. Input ratings: 115 VAC, 50/60 Hz, 25VA maximum. These AJ-300 series chart recorders are two-pen, microprocessor based units capable of measuring, displaying and recording varieties of inputs. Applications include: temperature, pressure flow and specialized controls for VAT pasteurization applications. Approximate weight: 25 lbs. Approximate overall dimensions: 14 in. L. x 8 in. W x 17 in. H.(ACN13).