These are the two calculators recently listed on Trade Me as unknown condition.

First 8 photos are the 28s and the last 5 are the 19B

Both calculators need repair - comes with a set of used batteries for testing!

see photos for condition and details

28s is in good shape overall no obvious major damage just wear It turns on but shows LCD black one side and nothing on the other, when selftest is done it appears to function as expected (pixels do display) and it produced service codes which printed on the HP thermal printer see picture. It makes beeps but I can't produce anything on the display. Key test shows that all keys function based on the beep and display of partial message at the end.

19B is in good shape overall no obvious major damage just wear but does nothing, this could be a faulty "on" key. I have tried the reset key combination and memory clear combination but got nothing.

Repair of calculators is not my area so if you want to have a go please bid, start is $1 and post/courier is $9. comes with a set of used batteries for testing! If I get $1 thats fine, the alternative is that these end up in the bin.

Please ask any reasonable questions.