Based on this product's specifications, here are some alternatives and similar models
Portable Gas Leak Detector install base HT61 — Methane sensor, 10% FS range, handheld
Summary description:
The install base HT61 is a portable gas leak detector designed for methane detection with a 10% FS measurement range. Handheld and battery-powered, it provides fast alerts for gas leaks in residential, commercial and industrial settings. Useful for maintenance checks, safety inspections and emergency response, it helps locate leaks quickly and improves workplace and home safety.