DEMONEXT, the DEdicated MONitor of EXotransits and Transient, is a 20-inch (0.5-m) robotic telescope using a PlaneWave CDK20 telescope on a Mathis instruments MI-750/1000 fork mount. DEMONEXT is equipped with a 2Kx2K CCD imager and a 10-position filter wheel with an electronic focuser.  DEMONEXT can operate in a continuous observing mode and achieve 2-4 mmag raw, unbinned, precision on bright V < 13 targets with 20–120 second exposures, and 1 mmag precision with binning on 5–6 minute timescales. DEMONEXT maintains sub-pixel (<0.5 pixels) target position stability on the CCD over 8 hours in good observing conditions, with degraded performance in poor weather (<1 pixel). DEMONEXT achieves 1%–10% photometry on single-epoch targets with V < 17 in 5 minute exposures, with detection thresholds of V~21.

DEMONEXT ended its run at Winer Observatory in early 2022 and was returned to OSU in 2023. In 2024 we began a project to refurbish and reboot DEMONEXT for redeployment at a new telescope hosting site.  The renovations include a new CCD camera and guide telescope/sensor system, returning the OTA to PlaneWave for cleaning, repair, and re-collimation, and an updated computer control system and advanced robotic software development.  This is a student-level project that is led by a graduate and undergraduate student at OSU with supervision from the ISL.

In March 2026, the refurbished DEMONEXT was installed at Sierra Remote Observatories near Auberry, California.