---------- ESTD. 1990 ----------
Model: DHR-201
Verification of Helmholtz law, Determination of volume of the resonator
Model: KTS-202
Determination of velocity of sound
Model: MEL-201
Verification of law of stretched string, Determination of frequency of AC mains
Model: RCA-201
Determination of velocity of sound in air
Model: ACS-203
Determination of frequency of the AC mains, Verification of the law of vibration of stretched string
Model: SMC-1209
Determination of speaker characteristics like frequency response, sensitivity, audible range, bandwidth, coil resistance, inductance, etc