One reason I buy used TI 84 graphing calculators is to use them as sensors, especially as digital thermometers. The TI 84 has a USB connector at the top of the calculator. EasyTemp connects firstly to the TI 84. Older sensors can connect to the TI 84 with EasyLink. TI 84 calculators come preloaded with the EasyData app. You plug in the sensor, the app opens, identifies the sensor, and collects data. Really. eBay has EasyTemp and EasyLink available. Be sure to unplug the sensor from the calculator when it’s not in use; the app and sensor eat batteries. I’ve bought both types of sensors used for eBay successfully. The pH sensors and older thermometers work well with the EasyLink. Not all sensors are compatible. Happily I use pH and temp probes most often. Scroll down for screenshots with eBay listings. My target for an EasyTemp is $10 and $49 for an EasyLink. Both the TI 84 and the sensors are a splurge. Since I teach science classes for the Co-op on an on-going basis, the equipment is used frequently.
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