Kekuatan tekan harusnya 60 ton ke atas (Sesuai ASTM D4280) Tidak ada retakan apabila bola baja 1,04 kilogram yang dijatuhkan ditengah paku marka jalan. Material kaca adalah fully-tempered. Paku marka […]

A min/max thermometer is a typical thermometer with a couple interesting changes. First, it has been bent into a U shape for convenience in reading. Also, the liquid does not […]