Proto J7183 00 Impact Socket Extension 1 2 in Input Drive Size, 1 2 in Output Drive Size, 10 in Overall Lg G0027991 CAT IV 600V AC Voltage CAT IV 600V AC Voltage Measurement Resolution Not Applicable Dustproof No Dustproof Waterproof_ADDITIONAL FEATURES Data Logging Minimum Storage Temperature 22 Degrees F Intrinsically Safe ADDITIONAL FEATURES Data Logging Minimum Temperature Measurement 40 Degrees F Computer Interface Connection Type None FEATURES HOLD_MERCH Backlit LCD Yes Yes NIST Certification By Manufacturer Techni Tool Maximum DC Voltage Measurement 1 TIG Welding (GTAW) brand mfr model MILLER ELECTRIC 907757 Process (Merch) SMAW This Proto Impact Socket Extension has a 1 2 inch input drive size and a 1 2 inch output drive size Perfect for reaching tight spaces and providing increased leverage for tough jobs