A calibrator is a device or reference material with a known value used to verify or adjust the accuracy of another device or instrument. Essentially, it's a standard that allows you to check if a device is measuring correctly and, if necessary, bring it back into proper calibration. Tessio have providing a Calibrators ensure that measuring instruments, like electrical testers, Resistance testers are providing accurate and reliable readings

TES-9015 safety performance comprehensive tester inspection tool is tool that meets the daily inspection needs of withstanding voltage, Insulation resistance, ground bond resistance and leakage current safety performance testers. It automatically switches various safety loads according to the input voltage, and each item has two inspection values ​​to meet different inspection needs. TES-9015 is mainly purpose to let the operator in factory inspection of electrical safety tester to alignment ensure that all tester to correct a result of testing before measurement to a products in everyday.

TSR-100 is a portable 4-wire standard resistor using nine 1/2W high-precision military-grade wire wound resistors. Designed to replace traditional single resistors like BZ3, enabling easy switching between resistance values. With up to 0.05% accuracy, it's ideal for calibrating ground resistance and equipotential testers.