ເບິ່ງແວ່ນ
Gelsonlab HSCG-1175 Laboratory Sapphire Double Dome 1.0mm Edge Thick Watch Crystal Concave ເບິ່ງແວ່ນ Plain ເບິ່ງແວ່ນ Beaker Cover
ຂະ ໜາດ 17mm, 17.5mm, 18mm, 18.5mm, 19mm, 19.5mm, 20mm, 20.5mm, 21mm, 21.5mm, 22mm, 22.5mm, 23mm, 23.5mm, 24mm, 24.5mm, 25mm, 25.5mm, 26mm, 26.5mm , 27mm, 27.5mm, 28mm, 28.5mm, 29.5mm, 29mm, 30mm, 30.5mm, 31mm, 31.5mm, 32mm, 32.5mm,,, 33mm, 33.5mm, 34mm, 34.5mm, 35mm, 35.5mm, 36mm, 36.5 mm, 37mm, 37.5mm, 38mm, 38.5mm, 39mm, 39.5mm, 40mm (ອາດຈະມີຄວາມແຕກຕ່າງກັນ± 0.05mm ສຳ ລັບເສັ້ນຜ່າສູນກາງ)