john go to ebay,you can get a good deal on one of these,it is a chatillon mod# IN-15,no batteries needed,and bullet proof.
i replaced the handle with a breaded line,and changed the hook to a finer stainless one,
sorry about the lack of info.
Yes, it is a Chattillon. I've had one for over 40 years. Solid brass. Almost indestructible. They are still sold in a variety of sizes and are advertized in some of the better high end fishing catalogs. The model I have weighs to 4 lbs. in 1/16 oz. increments on one side and kilograms on the other.