Select Products New Oil Tester OTS Series (OTS60/80/100AF and OTS60/80PB) - Laboratory instrument for measuring insulating oil      breakdown voltage - Lock in precision - oil vessel with lockable adjustment             - Bright 3.5” colour display visible out doors - Suitable for mineral. ester and silicon oils - Trip detection circuit with direct measurement of   voltage and current - Ultra fast (< 10 us) HV Switch off time