Taking a mathematics subject without using calculator seems unreasonable for a student in high school. The mathematics of high school makes it inevitable to purchase a calculator otherwise student cannot survive the complexity of equations. As the calculators are expensive devices, so before buying one many things need to be considered to avoid a wrong decision and wastage of money. Also keep in mind the strict instructions of teachers as some teachers do not encourage the use of some specific types of calculators in their class. Moreover, some of the standard exams like AP, PSTA and SAP also restrict the use of some specified calculator models while taking those exams. So, you have to make sure what exam you are going to take in a year or two and what restrictions might apply on your decision of buying a calculator. Also think about the alternatives like using graphing calculator TI-83 online.
If you are taking the subjects like statistics and advanced mathematics, some of the most stubborn equations involving graphs must have bothered you at some point. Earlier, these types of calculations need only to be solved on paper in a very lengthy manner but now a graphing calculator can do it in computerized manner. These calculators are expert in handling graphical representations and complex mathematical equations. It makes calculation very simple and fast. Solving equations and plotting graphs is no problem for them. You can also customize functions by yourself for other subjects you are taking like chemistry and physics. Data handling is their main quality. The older calculators fail to handle the data of more than one lines and made mistakes in that case resulting I wrong answers. These graphing calculators can handle multi-line data easily and show fractions in their original form like they are written manually on the paper. The mistakes committed in inputting the data can also be identified easily this way.
The calculators come in two types of displays, black & white and colored. Also the type of graphing might be 2D or 3D. The more upgraded features you want in calculator, the more prices you will have to pay. For starters who only want this for simple graphing, a black and white display model with 127 pixels display is good. Again you have to read out the exam policies by the regulating bodies of all those exams you are going to take shortly as if any restriction is imposed on any model of graphing calculator.
If you are not sure about the restrictions but still want to have a graphing calculator then first you should give a try to an online emulator. Graphing calculator TI-83 online emulator works same like a hand-held TI-83 graphing calculator. The emulator will give you an idea of how the graphing calculator will ease your calculations and help you in your studies. You have to use it on laptop or PC which is difficult to carry with you all the time especially in class so it is advisable to buy a hand-held graphing calculator after testing the emulator.