Level Comb, Flat Top Guide Comb for Hair Cutting, Large Teeth Haircut Clipper Comb with Accurate Water Leveling System Barber Shop Hairstyle Tool for Professional Use or Home Use (Black)

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Wahl (and other brands) also do a comb that isn’t as wide, but ideal for more experienced or professional barbers: Spencer, D. T. et al. An optical-frequency synthesizer using integrated photonics. Nature 557, 81–85 (2018).

Simply trim the hairs that protrude through the teeth of the comb. Rest the clipper on the comb and guide it against the comb’s teeth at right angles.Dong, B. Z. et al. Frequency comb dynamics of a 1.3 μm hybrid-silicon quantum dot semiconductor laser with optical injection. Opt. Lett. 44, 5755–5758 (2019). To maintain the flat top ‘look’ you would normally need to visit the hair salon every 2 to 3 weeks, which can become very expensive and time-consuming. Riemensberger, J. et al. Massively parallel coherent laser ranging using a soliton microcomb. Nature 581, 164–170 (2020).

Slide the comb onto the top of the head and lift it until you reach the desired length. Ensure you have the comb level and then cut the hair with your clippers.Mansuripur, T. S. et al. Single-mode instability in standing-wave lasers: The quantum cascade laser as a self-pumped parametric oscillator. Phys. Rev. A 94, 063807 (2016). Wan, Y. T. et al. High speed evanescent quantum-dot lasers on Si. Laser Photon. Rev. 15, 2100057 (2021).