Electronic Projects (Model 200 Series)


Size: 4.75" x 2.90" x 1.75"

201: Resistance Substitution Kit

An ideal project for student, experimentor, or technician. Substitute resistance values quickly and accurately for troubleshooting or designing circuits. Range switch selects LO (15 to 10k Ω) or HI (15k to 10M Ω). Two 12-step rotary switches selection of 24 different values.

Size: 4.75" x 2.90" x 1.75"

202: Capacitance Substitution Kit

Fast, accurate selection of 9 different capacitance values from .0001 to .22 microfarads. Very useful project for troubleshooting or designing circuits. Capacitors are rated at 400V or higher.

Size: 3.7" x 22" x 1.0"

213: Continuity Tester

Test electronic and electrical circuits

Audible resistance indicator

555 IC & piezo transducer

Easy-to-understand student manual

This handy tester is an excellent beginner's project. The clear, well-illustrated manual makes learning electronics fun and easy. Step-by-step assembly instructions ensure that every student will have a successful experience.

The student learns the history, operation (monostable and astable) and applications of the versatile 555 Integrated Circuit, as well as piezo transducers, by performing experiments while assembling the kit.

The tester checks circuits for shorts, low resistance, high resistance, and opens. An audio tone varies in frequency with the circuit resistance. Low current flow ensures that the circuit under test will not be damaged. Requires one 9V battery (not included).

Battery: Alkaline 9 Volt (P/N: BAT-9V)


Size: 8.4" x 1.0" x 0.7"

214: Logic Probe Kit

TTL, DTL & CMOS compatible

Red, green and yellow LEDs

Memory and pulse operation

Powered by circuit being tested

1M input impedance

Teaches theory and operation of the Logic Probe. The student performs experiments while assembling the double-sided PCB. 32-page Instruction Book. Use to troubleshoot and analyze digital circuits; check for HI (red), LO (green) and Pulse (yellow). Pulse Memory detects 30nsec pulses. Max. input frequency: 17MHz, max. input voltage: 20V. With rugged plastic case,insulated mini-grabber clips, durable leads and overvoltage protection.


215: Logic Probe Enhancement Kit

Parts for Audio Circuit (separate LO & HI tones) mount on 214 PCB. With IC & Common Clip Leads (plug onto 214) and durable Storage/Carrying Case


Size: 5.75" x 3.75" x 1.25"

216NB: Volt-Ohm-Millimeter without Breadboard

216: with Breadboard


30 ranges

Test transistor

Leakage and gain

Diode and fuse protected

Mirrored scale

Comprehensive student manual

Zero adjust

Accurate, rugged and versatile, the Model 216 becomes a useful piece of test equipment when assembled. Use it to troubleshoot electronic equipment, for laboratory experiments, and to aid in the building of other Graymark projects. This intermediate kit covers all aspects of analog meter theory including current limiting resistors, voltage dividers, diode rectification and meter protection. How meter movements work is also explained. Requires a 9V battery and two AA cells (not included).



DC Voltage: 1, .5, 2.5, 10, 50, 250, and 1000

AC Voltage: 10, 50 250, and 1000

DC Current: 50µA, 2.5mA, 25mA, 250mA

Resistance: X1, X10, X100, X1k and X10k

Decibels: -10dB to +50dB in 3 ranges

ICEO: 150µA, 1.5mA, 15mA

hFE: 0-1000

Diode: 150µA, 1.5mA, 15mA

Order No. 64616: Transistor Adapter (optional),


Size: 2.50" x 5.75" x 1.50"

218: Digital Multimeter Kit

Full 3-1/2 digit display

Data hold/peak hold with LCD annunciators

Transistor test jack

Short circuit beeper

20-range function

Comprehensive student manual

Zero reading with zero input guaranteed

Polarity driver

Analog to digital conversion

Frequency counter

The 218DMM is an excellent choice for educational electronic theory and project design. With comprehensive instructions, students will learn digital electronic theory and acquire hands-on skills through step by step assembly procedures. When assembled 218 DMM is a rugged, high reliable measuring instrument that's ideal for electronic maintenance and troubleshooting.


DC Voltage Range: 200mV to 500V

AC Voltage Range: 200mV to 500V

DC Current Range: 200µA to 10A

Resistance Range: 0Ω to 200MΩ


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