I wouldn't even use this for a classroom demonstration. There are many visible images of the spectrum and it is not immediately clear which one to use. (I suspect the scale is upside down.) I couldn't always find one that lined up with the scale. The slit is too wide to show clear lines. Disappointing and disappointing. I've had better luck with one I made myself by cutting out a grid out of toy rainbow goggles and a slit of cardboard and black tape, all attached to a paper towel tube. Of course there was no scale but I think it could be roughly calibrated using red, green and blue LEDs which would have given center wavelengths. If like me you have to wear reading glasses you might have better vision with them.
50 Pack 3Ml Plastic Transfer Pipettes Eye Dropper Moveland Pipettes Dropper
25 Review
14" Notebook ASUS Vivobook Pro 14 OLED K3400PA-KP112W 2560x1600, Intel Core i5 11300H 3.1 GHz, RAM 8 GB, DDR4, SSD 512 GB, Intel Iris Xe Graphics, Windows 11 Home, 90NB0UY3-M02070, cool silver
20 Review
Contact lenses Bausch & Lomb Soflens Daily Disposable, 90 pcs., R 8.6, D -7
55 Review
Orthodontic Distal End Cutting Pliers For Hard And Soft Wire | Dental Surgical Instrument For Braces Removal | Teeth Extraction Kit For Dentists | 1-Year Warranty
12 Review
2-Pack 32Oz All-Purpose Heavy Duty Plastic Spray Bottles - Leak Proof, Adjustable Nozzle For Cleaning, Planting & Pet Care - Green
22 Review
Laboy Glass 500ML Single Neck Round Bottom Boiling Flask Heavy Wall With 24/40 Joint Heating Reaction Receiving Flask Organic Chemistry Lab Glassware
16 Review
Get Your All-Purpose Cleaning Solution With Bealee'S 24 Oz Plastic Spray Bottles - 2 Pack
16 Review
Valchoose LDPE Economy Wash Bottle, Narrow Mouth Squeeze Bottle Medical Lab Plastic, Safety Squeeze Bottle No Spill, Bend Mouth Watering Cans (500Ml / 16Oz / 1 Bottle)
14 Review