Precision testing equipment for electrical and electronic applications, with strength in coil and transformer testing, is the specialty of Sandoy Teknologies, a Secunderabad company. Its flagship products include the Vasavi Digital Turns Tester (the VLCRTZ model) and LCR meters, built to measure turns, polarity, and DC resistance in toroidal or ring-core coils and current transformers, with selectable test frequencies (50 Hz to 10 kHz), adjustable test voltages (100 mV to 1 V in 50 mV steps), and high accuracy (plus-or-minus 0.2% + 0.5T for high- and medium-permeability cores). The testers support internal coil diameters as small as 0.2 mm and external diameters up to 200 mm using a dynamic voltage-comparison method, and Sandoy also offers winding turns testers for air-core, solenoid, and bobbin coils, ensuring precise measurements for various coil configurations.