heaps of wood pellets in front of a sieve and next to a calliper on brown jute fabric

accuracy biofuel biomass blue brown business calliper certified close-up concept confidence control craft design ecological efficiency energy equipment examining fabric factory front fuel granule group hand heaps heat heating home illustration industry instrument jute manufacturing material means measurement measuring metal metallic nature next oasis objects pellet pellets people protection quality rating renewable rough safety scale service sieve sign skill slide solution source steel support sustainable symbol technology temperature wood workshop