Hewlett Packard Programmable Scientific Calculator

[3000 Pages] For the last time I've coughed up $150 for print cartridges for a Hewlett-Packard, never again! SuperTank bottles are $12-$14 and have twice as much ink and a HP cartridge. Seems to print every bit as nicely as HP but costs WAY less to operate.

[Mechanical] I've been using this for work for a few months now and it's been working great. I set a programmable key for the calculator app which I use frequently. With use of 8 - 10 hours a day the batteries have not needed to be changed. The mechanical keys are much more accurate that the standard I've been used to using. Much easier to type on.

I've been using this for work for a few months now and it's been working great. I set a programmable key for the calculator app which I use frequently. With use of 8 - 10 hours a day the batteries have not needed to be changed. The mechanical keys are much more accurate that the standard I've been used to using. Much easier to type on.

[0.565 lb] Comfortable to use and programmable commends for various apps.

[0.06 lb] I tried a very fancy and highly scientific lens cleaner from Edmund Scientific, but it left streaks. In fact, I thought maybe the coating had been removed in places. As a last ditch effort, I bought this and sprayed it on and it turned out that the coating is fine and the lens is now clean.

I tried a very fancy and highly scientific lens cleaner from Edmund Scientific, but it left streaks. In fact, I thought maybe the coating had been removed in places. As a last ditch effort, I bought this and sprayed it on and it turned out that the coating is fine and the lens is now clean.

[Knob] This calculator is beautiful, stylish and perfect. Item exceeded my expectations. I would purchase again.

[3.5 x 2 x 0.1"] The battery is for an older calculator. Back of the calculator indicated a different battery. After opening the calculator took the old battery out and the new one from B&H in it's place. Simple fix.

[Fan] Very convenient to have in a grip kit. Good UI, very programmable.

[0.35 lb] Most ND filters do not block IR at the level suggested by their rating so images are overexposed if you use an LE calculator. These Firecrest ND filters are great for long exposure IR shooting with the resulting exposures very near what the calculator suggests.