Humboldt H-3250 Length Comparators User Manual
Page 6
Operation of Digital (Electrical) Indicator
This dual power indicator uses either internal batteries or an external AC
Adapter for operating power. The standard lithium batteries are Manganese
Dioxide Chemistry, listed under IEC # CR2450. A standard 2.5mm audio jack is
provided for use by the 9 VDC AC adapter; center pin is "+" (positive).
Installing batteries:
Using a narrow edge screwdriver, gently pry under the tab on the left side of
the bezel and slide out the battery tray as you turn the indicator face side down.
Insert two batteries, + side up, into tray cavities, then slide the tray back into its
bezel slot, taking care that the batteries stay in proper position.
figure 2
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