{"product_id":"hewlett-packard-299a-dc-amplifier-chart-recorder","title":"Hewlett-Packard 299A DC Amplifier Chart Recorder","description":"\u003cdiv\u003e\u003cp\u003eThe Hewlett-Packard 299A DC Amplifier Chart Recorder is an instrument that combines a DC amplifier stage with a chart recorder to log DC voltage signals over time. It is powered by 120 VAC, and the designation 299A AB is noted in the product description. The unit accepts low-level DC inputs, amplifies the signal, and prints a trace on chart paper, providing a visual record of voltage changes as time progresses. This configuration supports applications in data logging, monitoring slow-changing DC signals, calibration tasks, and educational demonstrations where a persistent graphical record is valuable. As a Hewlett-Packard product, the 299A represents HP’s approach to integrating amplification and recording in a single instrument, simplifying measurement chains that require both signal boosting and a physical trace of the signal.\u003c\/p\u003e\u003c\/div\u003e","brand":"HEWLETT-PACKARD","offers":[{"title":"Used Surplus - Excellent Condition","offer_id":46268441264362,"sku":null,"price":137.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0716\/8039\/3450\/files\/GTG-STOCK-051.png?v=1788727429","url":"https:\/\/gtghardware.com\/products\/hewlett-packard-299a-dc-amplifier-chart-recorder","provider":"GTG Hardware","version":"1.0","type":"link"}