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412300A-EU-EN v3.4 07/13 2
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Introduction
Congratulations on your purchase of the Extech Current Calibrator Model 412300A. The 412300A
can measure/source current and can also power a current loop. A built-in five location memory
can store customized calibration current output steps. The Oyster Series meters have a
convenient flip up display with neck-strap for hands-free operation. This meter is shipped fully
tested and calibrated and, with proper use, will provide years of reliable service.
Meter Description
1. LCD display
2. Battery Compartment
3. AC adaptor jack
4. Calibration Cable input
5. Function switch
6. Neck-strap posts
7. Keypad