Estes 1598PK3 A8-3 Model Rocket Engines, 3 Packs – 9 Engines Total with Starters & Plugs Condenser microphone for high accuracy

Condenser microphone for high accuracy & long-term stability

Includes nut

Output level: adjustable From0 to 100 mvrms (controlled by a potentiometer)

This specrometer's sturdy iron base incorporates a 20cm-diameter divided table with highly visible etched graduations and a Vernier scale that can be read to a resolution of 1 minute of arc

or by open collector transistor outputs

Estes 1598PK3 A8-3 Model Rocket Engines, 3 Packs – 9 Engines Total with Starters & Plugs Condenser microphone for high accuracyPLEASE NOTE: These are 18mm diameter engines. Please refer to the instructions that came with your rocket (or the rocket's product description) to determine engine compatibility. 3 Packs of Estes A8 3 engines total of 9 engines (each pack includes 3 engines, 4 starters, and 4 starter plugs) The A8 3 is a single stage engine designed for model rocket flights weighing less than 3 ounces, including the engine. This engine is ideal for smaller fields, or