How do you know whether to get a +2 or a -2?
1683131
I thought they were numbered and I purchased a +2. I actually don't use it because my T3i has enough adjustment to correct for my needs on the view finder.
1683132
It depends on what you'd eyeglass prescription is. You should check with you Optomotridt and find out what your prescription is and then get the diopter closest to that.Rich Signorelli
1943682
The directions are on test. 2 lines means negative. One line is positive. The second line may be very light but still negative.
1512786
That would depend upon the child. For most it would be grades 1 to 4 or 5 since it has addition and subtraction and then multiplication and division. Early learners might do the addition before school and those with challenges learning could use it as extra practice at any age. . . Our 12 year old daughter with some learning issues is still enjoying it.
1821701
It requires double A . I return this product twice because it would not work
1969671
I have not gotten a positive yet but it should be 2 vertical lines if positive. One line in the test area if a negative. This product is just like the 2 line tests from walmart, walgreens, cvs etc. It is NOT a + positive test.
55378
Yes you could use a 2.0. The number refers to the width just like you suspected.
994357
Hi,In order to subtract, you input the number you're subtracting from followed by the plus sign. Then put in the number you are subtracting followed by the minus sign.
960178
I'm having difficulty recalling as I use mine only at 0 deg. --- but it seems as if the choices were indeed only 0 and 90. EDIT: based upon consensus, I'm guessing that my previous comment is not correct!
483692
Thank you all, we have 2 no's and 1 yes...LOL how do I find out which is correct? It seems there is no way to ask the seller.
1653019
grade A they are deceiving everyone I checked on the amazon site and grade A is less expensive . So you pay the price of B and they send you A
533694
I believe they are +1.50. When I ordered them, I thought there was a choice.
1618218
Yes polarity matters. I don't know which is + or - however. I tested it one way, didn't work, reversed the polarity, worked.
1872571
Either triple A's or double A's. I loaned it to a friend so I don't remember for sure but it wasn't a special kind
344761
I was told that plus is stronger. Do not have much information other than that.
1293732
Hello- Yes the calculator has the + - key. If you put the - then # it shows -10 etc. If you put -10 - 10 it will show -20 etc. If you put 20+10 -10 it will give you the total for 20. Or 10 + -20 - 10 it will show -20. I hope I explained this ok.
271392
The BA plus (not the pro) is likely what your prof is looking for. Check your syllabus and with prof. The Plus PRO does a few more things than the Plus, so I would check but you are possibly safe with the cheaper Plus. Never hurts to make sure.
1574176
2 lines positive... 1 line negativeT= test line. C= control lineIf you get one line wether its T or C line then it's negative.. Re-test in 2 weeks