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Since I couldn't be without one, I bought this one as a backup. It has sat on a shelf in the lab for 17 years. The 4276A has a NiCad backup battery. Frankly, I find it pretty useless. So, on power-up, the unit will briefly display "Err 68" and then operate normally.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.