GTP API Gravity Calculator2 vs PixelTrace

The GTP API Gravity Calculator v2 (Developed 2025) from Gammon Technical Products, Inc. provides users the ability to determine corrected API at 60 Deg F for jet, gasoline, and diesel fuels. The calculator is a digital version of our GTP-3012-1A and GTP-2727EF slide calculators and it also is capable of calculating the total weight of the fuel.

PixelTrace is a free companion app for the xLights community. Browse prop catalogs from popular vendors, view interactive wiring diagrams, and print or export them for easy reference while you push pixels. BROWSE & SEARCH Search across vendor catalogs by category, vendor, or keyword. Filter by Christmas, Halloween, Singing Faces, and more. The catalog syncs directly from the same vendor library xLights uses — always up to date. WIRING DIAGRAMS Tap any prop to see a detailed, interactive wiring diagram showing start node, end node, and string lengths. Flip between front and rear views with a tap. PRINT & EXPORT Export diagrams as print-ready PDFs scaled to letter-size paper. Share diagrams with your crew so everyone can pitch in on wiring day. FAVORITES Save your go-to props for quick access. No account needed — everything is stored on your device. BUILT FOR THE COMMUNITY PixelTrace pulls from the open-source xLights vendor registry. Vendors can submit their prop libraries to the xLights GitHub repo and they'll appear automatically. Free. No ads. No account required. No personal data collected.