RISH Instruments Pvt. Ltd offers Digital Insulation Tester 1 kV, RISH Insu 10. RISH Instruments Pvt. Ltd. Is the manufacturer of test and measuring instruments & industrial control products. The Digital Insulation Tester has Low Resistance Measurement of 0.01 to 99.9. The Voltage Measurement is 25V to 600V AC/ DC. The Digital Insulation Tester also includes Insulation Resistance Measurement from 10 k to 999M and Selectable Test Voltages of 50V/ 100V/ 250V/ 500V/ 1000V.