STS provide personal and professional quality materials testing services for civil engineering organisations. Business Hours: Mon-Fri 7.00 am-6.30 pm Sat 7.00 am-5.00 pm Sun Closed Site Testing Services Ltd provides a personal and professional quality materials testing for UK civil engineering organisations. Here at Site Testing Services Ltd we undertake expert laboratory testing, and our highly qualified technicians provide a personal on-site service that is unrivalled. We test a range of materials including aggregates, bitumen, soil, natural stone and concrete using testing methods such as Plate Bearing Testing and CBR Testing