SG90 Servo Tester Kit with Battery Holder

Try a small servo on the bench before building it into a model. This kit brings an SG90 micro servo, a servo tester and a four-AA battery holder together for manual, automatic and neutral-position checks.

✅ Try the servo movement before installation - Manual and automatic tester modes let you observe the movement outside the finished model.

✅ Find the neutral position for assembly - The neutral mode provides a reference when arranging the servo horn and linkage.

✅ Keep the test separate from the model's controller - The tester and battery holder provide a bench arrangement without first wiring the servo to the model's control electronics.

Understand the Movement Before Adding the Linkage

Connect the kit according to its polarity and power instructions, then observe the servo without a mechanical load. A bench check lets you see the available movement and neutral reference before choosing how the servo will sit in the model.

Arrange the horn and linkage around the intended task, leaving room for the mechanism to move without binding. The SG90 is a small positioning servo, so match the load and travel to its actual specification rather than forcing the linkage against a stop.

Technical details

• SG90 9g-class micro servo; 180-degree specification
• Servo tester with manual, automatic and neutral modes
• Four-AA battery holder with JR connector
• Actual selection: one kit
• Prepare suitable AA cells and confirm the permitted supply arrangement

Bring the servo to the bench and plan its movement before finishing the model.