You searched for "timer function"
Martindale
Martindale TEK 300, Multi Function Calibrator - RS Calibration
Part: RSTEK300
Portable calibrated loop calibrator for electrical measurement instrument verification.
Druck
Druck Genii Multi Function Calibrator, 20mA, 30V dc / 300V ac
Part: DPI620G-FF
Portable battery-powered calibrator for testing and adjusting electrical voltage and current devices.
Druck
Druck Genii Multi Function Calibrator, 20mA, 30V dc / 300V ac
Part: DPI620G
Compact portable calibrator for adjusting and testing electrical voltage and current instruments.