Industry observers note that some of us here at PCWorld really liked Kensington’s chunky Expert Mouse TB800 EQ because it’s a comfy wireless trackball mouse with easy-to-use buttons and scroll wheels you can map to whatever functions suit your fancy.
As part of the ongoing story, that excitement quickly gave way to disappointment, as users started reporting tracking accuracy issues not long after. It was also the first fresh iteration of the Expert Mouse that Kensington had dropped in roughly a decade, so there was plenty of excitement from trackball enthusiasts when it launched in 2025.
As part of the ongoing story, it’s nearly identical in appearance but promises to eliminate the sensor tracking issue that plagued the old TB800 EQ. Kensington, to its credit, pulled the TB800 from store shelves earlier this year and dropped a fresh model, the Expert Mouse Pro TB900 EQ.
In a fresh development, our own Adam Patrick Murray was a fan of the original award-winning TB800 trackball mouse and used it regularly, so who better to evaluate its successor to see how it stacks up?
As part of the ongoing story, he touches on everything from design changes to the fresh dual sensors Kensington put in the TB900, and you may be surprised by how much of a difference he discovers in these seemingly identical mice. After spending months testing the fresh TB900 EQ, Adam hopped in front of the camera to showcase the two devices side-by-side and walk you through what’s changed (and what hasn’t) with the most recent edition of this comfy, customizable trackball mouse.
In a fresh development, for more hands-on insights into the most recent and greatest devices make sure to subscribe to PCWorld on YouTube and check out our weekly podcast, The Full Nerd!
In a fresh development, as part of PCWorld's video team, you can see him going hands-on with the most recent and greatest tech on YouTube, TikTok, and Reels, and his writing will appear on PCWorld.com. Alex has also written for Tom's Guide and Platform release Developer. Alex Wawro has more than 15 years experience as a tech journalist, and has covered everything from laptops and CPUs to PC tech industry and handhelds.