calcium test... need help reading it

Kwater

Chill
i just did my first calcium test. the pacage did not tell me what the resolts should be so i was helping that u guys could help me out.

i am using kent marine liquid calcium. on the back of the bottel in a little chart it says the recomended levals should be 400 to 450 ppm. my test came out 1.933333333333 so on. my tank is 40 gallons with a clam, is this test ok. also the test was taken at the heighth of the lights right before i turned them off
 
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