There are plenty of test kits on the market suitable for both novice and advanced enthusiasts.
Salifert kits are on the budget side but are very effective and reliable for calcium, alkalinity, magnesium, potassium and nitrate.
When testing for phosphates, Hanna Checker are well known to be fairly accurate. Hanna Checker does cost a little more then the average titration method, but when convenience and accuracy are selling points this will always attract a higher price tag.
Neptune Apex is a great control unit for continual daily monitoring on a more elaborate scale and allows for direct monitoring on your smart phone. The system will display pH, Conductivity, Temperature and Oxidation Reduction Potential (ORP). This can be recorded on graphs and logged for future data processing and management of your system.
The below links will help you further with your research:
Happy Reefing 🙂