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1. Case: Clean and intact (loose screws, broken parts, cracks?)
2. Earmold: Cerumen, dirt, cracks?
3. Tubing: Clean, cracked, crimped, clogged, collapsed, connected to earmold/aid securely.
B. Battery Check
4. Clean: Free of corrosion/dirt etc.?
5. Charge: In green(good) range or above 1.0 volts on tester?
6. Size: Correct size to fit battery compartment?
7. Compartment/contacts: Clean and intact?
8. Insertion: Proper placement – "+" and "-" sides oriented properly?
C. Listening Check
9. Switch: Off on "O", amplification on "M", Hum on "T"?
10. Noise: Unwanted sounds – hum, static, motorboating?
11. Feedback: Squealing at low to moderate volume settings or at high settings with earhook covered?
12. Linearity of gain: Volume increases gradually as volume control is turned up?
13. Scratchiness: As volume control is adjusted?
14. Intermittence: Reduction in gain or cutting out as aid is pressed between fingers? As controls are manipulated?
15. Distortion: Loss of clarity with 6 sound test (u, i, a, s, sh, m)?