Current meter instead of multimeter?

[CAMSHAFT]

Hello,
  I recently bought and built a Hoffman bias checker.
I am concerned because my multimeter manual says not to
Leave it in the circuit for more than 15 seconds!
I'm wondering if i can use a milliamp current meter
Instead, and if then i could keep it in the circuit indefinitely.
Can anyone offer me any good advice?

[RicharD]

The Hoffman current checker has a 1 ohm resistor so you are actually reading voltage and not current with your meter.  Since we know that E=IR, and R=1, then E=I.  Much safer approach for the user, and the meter. 

[CAMSHAFT]

Yes, I see what you're saying, but the version of the one i have does not have a resistor and
measures current. 

[sluckey]

The Hoffman current checker has a 1 ohm resistor

I don't think so...   

I am concerned because my multimeter manual says not to
Leave it in the circuit for more than 15 seconds!

I've never seen that warning. What multimeter do you have?

I'm wondering if i can use a milliamp current meter
Instead, and if then i could keep it in the circuit indefinitely.

Absolutely.

[PRR]

> not to leave it in the circuit for more than 15 seconds!

At HIGH current, the internal resistor may over-heat. The 20 Ampere range could be dissipating 4 Watts inside the plastic case, not good.

Tubes suck 0.05A, maybe 0.2A in extreme beast-amps. This is 0.04 Watts or less. The multimeter can carry that continuously forever.