DIY enthusiasts and tradespeople who measure on a daily basis will find the RETLUX RHT 100 to be a compact, 110g tool for readings up to 40m with an accuracy of ± 2mm. Surface, volume, indirect measurement (all methods), addition, and subtraction: all these functions are packed into a 112 × 50 × 25mm housing. The 30 storable values prevent unnecessary back-and-forth, while the automatic backlight ensures a clear reading in all lighting conditions. Powered by 2 AAA 1.5V batteries, it switches off automatically after 150 seconds to preserve battery life—a detail that counts on a busy job site.