Supports the following standards: ASHTO TP-95, AASHTO T358-15 Surf™ is a laboratory non-destructive test device for rapid, easy and accurate measurement of the surface electrical resistivity of concrete based on the four-probe (Wenner-Array) technique according to AASHTO TP 95-11, and pending ASTM specifications. Surf™ has a unique and customized setup, which enables the measurement of electrical resistivity with high accuracy by reducing the duration of the test and minimizing ambient effects. The Surf™ provides a test cradle for 4"x 8" and 6" x 12" cylinders, which provides four (4) 4-sensor arrays positioned at 90° intervals around the cradle. Surf™'s patented technology automatically takes measurements at each of the sensor points around the cylinder and then repeats the process for all 8 measurements in less than 15 seconds. The included PC software takes this information and generates the reports required by the standards. Applications: Performance-based, quality control testing Estimation of chloride diffusion coefficient Service-life design of concrete structures Remaining life estimation of structures Crack detection in under load concrete Monitoring the setting time of fresh concrete Features: Patented technology Fully compliant with both AASHTO TP95 and the upcoming ASTM standard Fast measurement (8 measurements < 15s) Four-channel surface resistivity meter Variable frequency (13 - 100 Hz) Limits moisture loss Automatic report generation with PC software Fresh concrete testing/crack detection Specifications: Measurement Channels - 4 Measurement Display - Yes LCD Display Area - 65 x 33 mm Dimensions of Device - 200 x 160 x 70 mm Software - Surf™ Data Monitor The Giatec Surf™ kit includes" the Surf™ unit, 100 × 200mm (4" x 8") sample holder, power adaptor, USB cable, communication software, user manual, and conductive gel.