| MODEL | INPUT / RANGE | DESCRIPTION |
|
874 | 1 Hz to 1Mhz | 4 or 6 digit Frequency meter / tachometer |
| 884 | 1 Hz to 1Mhz | 4 or 6 Variable timebase frequency meter / tachometer |
| 894 | 1 to 100 Hz | 4 or 6 digit Low frequency meter / tachometer |
| 2992A | 40 Hz to 10 KHz | 5 digit Totalizer / Timer / Hr Meter / Tachometer |
| 2992B | 1 Hz to 5 KHz | 5 digit Tachometer |
|
6121C | DC to 100Khz | 6 digit Frequency meter Tachometer |
| 6104C | DC to 100Khz | 6 digit Frequency meter / Rate Indicator / up down counter |
| 8010 | 0 to 5 KHz | 6 1/2 digit Timer / Counter / Frequency Meter / Tachometer |